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Saturday, October 17, 2009

Yellow Sac Spider






Abdomen - Round and can be yellow, tan or slightly green.

Cephalothorax - Tiny. Usually a tan color.

Female Size - NA

Male Size - NA

Bite Info - Believe it or not, these little guys are one of the more dangerous you will find in Michigan. They are the most common spider to be bitten by and their bites are sometimes mistaken for that of the Brown Recluse. Although their venom is not nearly so dangerous as the Recluse, the bite can sometimes leave heavy swelling and even leave open sores.

THere is a lot of bad info on the net that states that the Yellow Sac Spider uses the same cytotoxin as the Recluse does, but not as potent. I have recently learned from Rick Vetter, the top Brown Recluse expert in the world, that this is not true. This bad information was started by someone who was looking to gain from causing fear. I am one of those who fell for this bad information and helped spread it. I apologize for that.

Other Notes - During the daytime these spiders often hide in a small blanket of web under leaves and wood, but often will make their way into homes and hide in corners or under window sills.

Genus - Cheiracanthium Mildei

89 comments:

  1. This comment has been removed by a blog administrator.

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  2. I had yellow sac spiders invade my home last year. They are not fun to deal with. I've been using a pest control company ever since so that they don't come back. I was even lucky enough to find a company that uses non toxic, organic, pest control stuff on localpestcontrolservices.com.

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    1. We had an infestation this spring and I have found a few this fall. I mixed water with peppermint oil and dish soap. They drop immediately when sprayed and die quickly. Stand back though because they will drop right on you if you are in the way. We also sprayed the perimeters of all our doors and windows, that seemed to help. Also tried a pesticide by Terro for poisonous spiders and after spraying outside around the windows and doors we didn't see any till fall.

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  3. i see this all the time on my car at night! i had no idea they could do that with a bite, im quite scared now. haha

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  4. I have found that when you find these in or on cars a lot, it is often due to parking the car under a tree at night or in a car port that has them at night.

    I should re-word my post on the Yellow Sac Spider however. Though they are one of the more dangerous in Michigan, they are not considered to be dangerous. Most bites leave small red blemishes. It is not often that the swelling happens. However it does happen.

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    1. I was bitten by one not long ago, a bump on my neck appeared the size of a pea or slightly larger. I wasn't sure what spider it was although I knew it was a spider bite. Later I had killed a few yellow sac spiders and found that that had to have been what bit me. No skin deterioration luckily just the bump, the swelling went down after a few days. Thanks for the info guys!!

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    2. I have these little suckers all over my house. I didn't know what they were until I looked on here. I got bit by a spider a little over 2 months ago just above my ankle. The thing still itches like crazy and there is still an open sore there. I put anti-itch cream on it all the time, but it barely helps. And it is still all swollen. I am thinking now that this might be the spider that bit me. How do I get rid of these things? I had my house bombed 3 weeks ago but they are still everywhere. Yesterday there was one crawling on my kitchen cabinets.

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    3. I was bitten on the forehead by one of these. I had terrible pain that radiated down through my neck. The bite itself opened and took a long time to heal. It was a terrible experience!

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    4. Im getting bit by a spider in my home. I usually get them on my head. I wake up with a big bump and it hurts like HECK!!! It takes a few days or longer for the bump to subside but the pain of it - it simply hurts. Ive been looking on here for what kinds of Michigan spiders it could be. Im thinking maybe this one? I have a lot of tan looking spiders around the house and in the rooms coming from the basement. Any ideas if this is the culprit??

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  5. These are the most common spider EVER in my home i find these EVERYWHERE!! mostly in the corners of my home they have never bitten me before

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  6. Yes, they are extremely common. I get them more than any other spider except possibly the Daddy Longleg. They are not aggressive by any means. The way people usually will get bitten is if they are crawling in the bed at night and get rolled onto or something.

    In all honesty, though they are one of the more common spiders to be bitten by in Michigan, it is not very common to get bit by spiders in general. More often when people think they were bitten, it is often something else entirely. When we are bitten in our sleep, we often do not even ever know it because the bites leave little reaction. Only in the abnormal cases do we get bitten and it also leaves a real reaction.

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  7. This has been the most common spider in my Detroit home over the last 10 years. I have had a couple severe reactions to spider bites and suspect the yellow sac spider was responsible. The first severe bite was disgnosed by a physician. I had developed an unusual sore in my armpit. I was worried it might be cancer. I visited a doctor who diagnosed it as a bite. I lost flesh at the site of the bite and now have a scar. I have had sevreal more bites over the years with one causing a similar but not as severe abcess.

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    1. You might never see this, but I hope you went to the doctor for the sore in your armpit. To my understanding, Shingles can break out as a sore in the armpit. If you get Shingles and can get treatment right away, there is a good chance it will never come back, but if you do not get it treated, it can continue to come back every now and then for life.

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  8. i get these dang things in my car allllll the time im seriouse almost every week i see another one come crawling past while im driving then next thing u know im off in the ditch cause icrap myself

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  9. My guess would be that you park under a tree or under a car-port. Yellow Sac Spiders love certain trees. Every time I have had problems with them in my cars it was when I parked under trees.

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  10. i was wondering if these lil guys have a black 8 shape on there belly? i live in houghton lake and at night my windows and front door get covered with them...

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  11. I have never seen a shape like that on them before. From the description of how your window and door get covered by them at night, that sounds more like an Orb Weaver to me. Orb Weavers come with all kinds of different patterns and colors.

    If you could some how get a decently clear picture of one and email it to me, I might be able to tell you what they are.

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  12. We are invaded by Yellow Sack Spiders every spring and fall in our house. It is almost a guarantee that every morning, I will wake up to find 2 or 3 webs with the spiders in the corner where the kitchen wall meets the ceiling. I was reading up on them, it took me a long time to identify them online, but apparently the ones invading our house are not a native species- because they have a green tinge to them.
    Very interesting spiders to me. I have enjoyed them much more since learning about them- although I liked my ignorance when I thought they were completely harmless spiders. =)

    Often times if you try to get them with the vaccuum etc... they will 'drop' from their webs. We have gotten some very large versions of these spiders in our house. I've found as long as I suck them up before dark (they are night hunters- who walk all over the walls/floors/ceilings to hunt for food) that works- however every morning without fail- there are 2 or 3 new ones. I've learned to live with them, and let me tell you I have a horrible fear of spiders. It's so bad, I can't even suck them up with the vaccuum, someone else has to do it.

    For some reason this year, our home has been infested with very large black spiders all over the walls- that appear to be 'wall hunters' as well. I'm not sure why (obvious answer is whatever their food source is- must be easily accessible in our home)- but we are finding 3-4 in our house every single day. (Which is how I landed on this site.)

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    1. The large black spiders are likely hunting your yellow sac spiders. I had some pretty large black jumping spiders in my old home that would show up with the yellow sac spiders. Within a week or two, all the yellow sac spiders would be dead and the black jumpers would remain. Which was great, because those yellow sac spiders were always biting my family.

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  13. I was bitten by one of these buggers hiding in my sleeping bag. It left a 1 inch wide mound of necrotic flesh that had to be cut out of my leg. And it felt like someone whacked me in the shin with a chunk of steel rod. It took weeks to get better and loads of very potent antibiotics.

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  14. I am wondering if they are ever darker in appearance. I have had what I believe to be wolf spiders in my house through out the summer and we have an agreement, as long as I can keep a head count they can stay and kill flying insects. In the past two days I have seen spiders similar to the Yellow Sac but much darker. I have had to execute them because they are too sneaky and will just suddenly be sitting on a book I am about to pick up. They are very crunchy when I squish them and don't move very fast.

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  15. @Kelly, I am not entirely sure if those spiders are even yellow sacs. Yellow Sac spiders tend to be rather speedy and I haven't ever seen any yellow sac to be any color other than yellow(obviously),tan or a greenish-tinge. @Bruiseviolet I hope that last part of my reply to Kelly helps you, the green-tinge colored yellow sacs are native as I get just about all three colored yellow sacs in my home.I use a pesticide to kill them off as I don't want them biting my younger sister, however if you can take care of them without using chemicals, I strongly advise that.

    Now back to Kelly, you most likely have encountered wolf spiders as it is possible for a few to invade any home. Wolf spiders are...well rather thick if I must say so myself, so I wouldn't be surprised if they were "crunchy" when squashed. I also would like to let others know as stated before, your cars and homes are most likely invaded by a great amount of yellow sacs due being under some kind of tree, such as my home is.

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  16. Do you know what kind of tree? I have these all over inside my home as well especially in the basement. I do have the darker brown spiders like Kelly explained but mine are fast like the yellow sacs..they're definitely not wolf spiders because they're not hairy at all. When squished they're very 'leggy' if that makes any sense like they're all legs but their body definitely has 'gerth' to it. Any ideas?? They are crazy fast! And find just as many as the yellow sacs in basement but the brown ones venture upstairs more that the yellow sacs and I see the brown ones more during the day than I see the yellow during the day. I find the brown ones a lot balled up dead under toys/tables no webs around them - my cat bats them around a lot

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  17. From your descriptions I really cannot say what kind they are. Even though I have some pics of spiders in this blog, it is amazing how many people will send me a spider I list asking what kind it is. They often think it is one kind and it is another.

    IF it is at all possible for you to email me a picture of one, that would go a very long ways towards identifying them. Sac Spiders are very common but this time of year it is just as common to have Wolf Spiders and Grass Spiders. The description of the legs and such sound more like Wolf Spiders or Grass Spiders.

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  18. ohhh great my house is over ran with these and u drop a bomb like this on here like ever corner i turn there at least 2 and iv been shooting them with my air soft guns to keep them at bay also whats the best way to get rid of them cause iv bombed my house at least3 times or should i just release a bunch of hunts man spiders to eat the sack spiders but then id have to spend a bunch of money to get them here then deal with them and they are a bit more dangerous lol

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  19. Are these spiders more commonly seen in any particualr season? & are they more agressive in any particular season?
    I was scared of spiders before, & now I'm totally creeped out that these little guys are "venomous". I see them all over the place.

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  20. They are venomous but not so you need to be afraid of them. Remember, being one of the most dangerous in Michigan, does not necessarily mean real dangerous.

    Let us put it this way. The Yellow Sac Spider is extremely common. Personally I have seen more of those than probably any other spider. They are also possibly the most common to be bit by in Michigan. Yet the bite that causes any real problem is not common. I only post about it so people know it is possible.

    If you get a lot of them in your home, there is a chance you might have trees above your home? They love certain trees and drop from them onto houses and cars. You will have to get an exterminator then get your own spray from Home Depot (comes in a gallon jug with a hose and spray nozzle) and spray outside around windows and doors every couple of months.

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    1. Ortho Home Defense Max spray is awesome for safely eliminating and preventing the recurrence of Yellow Sac Spiders. It can be sprayed all around the house, in corners, along baseboards, ceilings etc and it keeps them away. Safe around pets when dried as well. Great stuff for keeping centipedes and other undesirables away.

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    2. This stuff does not work for them! I have sprayed my whole home twice now and they are everywhere still! I am a magnet for spider bites and I currently have three. I am pregnant due on Sunday and I am terrified that these spiders will bite my baby. Do you have any other suggestions?

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  21. I was bitten by one of these about 6 days ago. The sucker was hiding in my coat sleeve. About 2 hours later, my arm started to itch and throb at the same time. I went to ER 2 days after the bite occurred, as my entire forearm was throbbing and the bite swelled, became pussy, etc. The doctor used a needle to open the sore, drained all the puss, and put me on two different kids of antibiotics. The medicine has done wonders. The sore is finally scabbing over, the swelling went down, and there is no throbbing feeling anymore. It is still very red however. Needless to say, I am checking my coat now everytime before I stick my arm into it! :)

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  22. just felt something crawling on my arm and it was a yellow sac.i knocked it off and it just sat on the floor until i crushed it. i have had some bites on my arms but wasnt sure what bit me so im thinking it was yellow sacs. the bites were small red lumps that lasted a long time but are finally going away. i hate bugs that bite in the night!

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  23. What is a good holistic way to deal w spiders in early january espically yellow sac spiders in michigan

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  24. Stomping, Death by Paper Towel, Vacuums, Fly Swatters and Rubber Bands. Cats can help too and are benefited by the extra protein. :o)

    Sorry. Sense of humor sneaking through there. lol

    To be honest, I am not real sure. Other than spraying around windows and such, I am not sure what else there is. There may be some traps, like ant traps that will work. If I learn anything, I will be sure to post it.

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  25. i am from allegan michigan and i found an egg sack from a spider not knowing what kind they were and winter was right around the corner so i took them in. then later when it was a cozy 65 inside and a cold 30 outside they started to hatch and they right now are small to very small and they are a yellow with what looks to be a small red dot or pattern on ther back . so i thought maybe it they were yellow sac spiders because i found this blog. but then again they are only weeks old and still pretty small so do you think they are yellow sac spiders. maybe if i take a pick and send it to you do you think you could tell me

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  26. My 4th grade daughter is interested in doing a science fair project using the yellow sac spider since we found one inside on our window sill in the basement. Specifically, after learning it is a nocturnal feeder, she is interested in determining if the spider will stay in it's cocoon-like 'den' at night if we put artificial light in the area of the den, making the spider unsure of the time of day.
    As this needs to be a controlled experiment, Our question is do you have any information on if the spider will most likely move and create another den elsewhere if we try to alter it's perception of day and night or will it generally stay in it's already made den.
    Thanks for your help!

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  27. JAKE: I really could not say what kind they are from the looks of the infant spiders. Sorry. I truly am no real expert on spiders. I help people identify spiders as much as I can but my knowledge is limited and unfortunately what each spider looks like as a baby would be beyond my ability. You may try to type "Yellow Sac Spiderlings" or "Wolf Spider Spiderlings" in Google images and see if the pics that come up match what you have. Sorry I can not help more in this case.

    ANONYMOUS: In some ways it does sound like a good project, but you might want to be aware that they do not always move around every night. We get them in our house and there have been times I found one in its sac and was in a hurry then forgot about it until I saw it there the next day or two days later. Though they do hunt at night, I dont believe they leave their sacs every night.

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  28. I have seen these spiders in my house sometimes. I never really thought much of them, I just assumed they were one of those little spiders that don't have a very strong bite. But now, I am kind of tempted to let one bite me just to see how painful it really is, and so if I ever get bitten by that spider again I will know what it was. I just killed one about 5 minutes ago. I am able to identify them and many other spiders because I find spiders amazing, and I love to study them and learn all I can about them.
    And I am only 14

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  29. I would never suggest anyone let any spider bite them. Even a spider that is not dangerous can sometimes on the rare occasion leave a nasty bite if the person has some kind of allergic reaction to it.

    In most cases the bite will leave no reaction or just a small sting for a couple of moments. Even in the dangerous Brown Recluse, it does not always leave a dangerous bite. So to let one bite you might not tell you much anyways as the next time one bites you it could use more venom or you might react differently.

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  30. keep reading that yellow sac spiders like trees. but what kind of trees? we have problems with these pesty guys in our cars and we park under a big maple tree, so i dont know if they prefer just any tree or maple?

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  31. I really cant tell you that for sure. I dont know if they prefer a certain tree. I do know they like other trees too, but which ones I cant say. Mostly I believe they just crawl up. If it is a tree then its a tree. It may be a wall or a bush or a pile of wood or a fence. But I would definitely say you get them in your car from parking under the tree.

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  32. I was on my cell phone in my bedroom when I saw a spider that looks exactlly the one in the picture just minding its own business walking along the night stand. Usually when I see a spider I want to kill it as quickly as possible because I for one don't want to be sleeping and get bitten by them, plus I do have somewhat of a fear of spiders that I have had to learn to control especially if I want one killed. Anyway on this day that I saw it, I don't know why it didn't bother me seeing it, probably because I was on the phone... but NOW I can't find the thing. I have looked for it and no sign of it... is it a type of recluse? Would it hide UNDER my nightstand? I do not want to be bitten by this thing... is there a way I can draw it out of its hiding spot? It looked exactly like the picture you have here with the "bubble" butt,light tan and small.

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  33. Unfortunately I do not know of a way to draw one out. It has likely either moved on, or put itself in a sac in some corner. It is quite possible it could have lodged itself in the top of the blinds or shade, as spiders tend to always climb upwards and end up on the floor after dropping down on a strand of webbing or falling.

    It is good that you didn't get frightened, That is one step to overcoming your fears. Getting interested or just intrigued by a spider helps. But for the future? I would suggest you still get rid of it while you can as they do tend to disappear quite fast. :o)

    Either way you dont need to be afraid of it being around. However clean you keep your place, you would be surprised at how many spiders we ALWAYS have around us that we dont see. The chance of being bit by him is minimal as it is and then the odds of the bite causing any harm is minimal as well.

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  34. I live in a basement and regularly find 1-2 spiders a day. However today (perhaps from the early spring?) I have squashed about 7 spiders. Thanks to your site I can now say about 5 of them were Yellow Sac Spiders, and 1 was a wolf spider. The last one was unfortunately left unidentifiable after I torched it with my lighter. Also from now on I will be happy seeing daddy long legs around : )

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  35. I have these spiders everywhere!!! I literally killed 30 of them last night on just one wall in my house. I think they are living in the wall! One of these guys did bite me a few weeks ago on the leg, I had a pretty gnarly reaction as well. my whole leg swelled and bruised. It was awful! I have been trying everything to get rid of them, and I did find one thing that keeps them at bay at least. Peppermint oil and any citric oil like orange or lemon will keep them away. for some reason they do not like it, it works and is nontoxic for pets and people and doesn't smell bad if you like mint :) I use it around windows and in all the corners, you do have to add more every couple of days but I swear by it! try it out!

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  36. I just found one of these in my house I have it in a water bottle, fast yellowish, with a greenish tint to it. My brother was bitten living in my basement a week or so ago on his lower back. it swelled up like a boil abscess with a black dot in the middle, about and inch in diam. swelling and very raised/ painful bump. He went to the doc and is being treated with antibiotics and had an iodine pack shoved in the hole. not sure if I can send a good pic to you thou but could try. It looks just like the pic you have in the bottom left of this page but abdomin is more narrow. We burn wood and keep some in the basement often. I'm sure their are many more than just one!! with in a half hour this thing has spun a web all around the bottle.

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  37. We just moved In a house that has this spider everwere I have killed 10 of them in the last 10min in my house how can I get rid of them

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  38. What is the best way to kill the yellow sac spider? What type(brand)of spray works best?

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  39. i would also like to know what i can get in mich besides a professionally, that will kill spiders i just moved in a home that was abandoned for a while and the basement was flooded for a while also . now that summer is coming around i have found 4 different spiders so far. we had a professional come out to spray for fleas a couple of weeks ago which the spray didnt even harm the spiders! anyways i have lots of grandchildren that come over and my daughter who is petrified!! of spiders she wont come over if she knows i have any so i really need to get rid of them , and i bet there is a million of them in my basement which i need to get rid of too. thank u for any info u can give me. thanks terri h. from holly mich.

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  40. My personal favorite weapon against Sac Spiders is a good long rubber band. You would be amazed at the damage a good rubber band can do if you know how to use it right. lol And believe me, there really is a right way that most people dont know.

    I would say a bug bom that also kills spiders would help. Those can be messy though and I dont know how they work in basements and such where there may be an open flame in a furnace and such.

    My second favorite weapon is a gallon jug of Ortho Home Defense Max, from Home Depot. Spray it around windows and doors outside and maybe around windows in basement. Read directions first.

    Lastly, I would say to tape Cheese Cloth over vents (through house) and drains (in basement)

    Sorry. I just dont know what else to say. Get a cat maybe. :o)

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  41. I get these little dudes every fall and winter in my upstairs bathroom. I really have no beef with them because they're super cute with their teeny little eyes and little cocoon homes. Actually, I rather enjoy them because they have never caused me a lick of harm and, whenever I'm done running hot water from a shower or cleaning my pet rat cage, the litte buggers come out from their cocooned corners and start collecting the condensation from the mirror onto their front legs and licking it; it's so precious to watch! If you're truly afraid of them (like my sister was when she lived here) just catch them and let them outside; there's no need to kill them. If I had that attitude towards everything that could potentially harm me, I would be killing evil, devil-spawn hamsters at my job everyday!

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  42. I just found one on my couch, barley noticed because he blended. I got bit by him last week, left a thick bump about one inch and was very itchy.

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  43. Just saw a spider crawling next to me on my couch and i freaked out but then decided to look it up. From this website this one looks the most like it except it was more green. How big are these, because I'm not used to something of its size where i sleep. I didn't look too much at the details or it but it seemed to me that it was bigger than a quarter with all its legs

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  44. Lived in my home for three years now. The first year we had alot of yellow sacs showing up. I have a big tall oak that we park the cars under and yes they find their way in. I got tired of it and toasted the yard with the pellets you get for the spreader. We used them for our carpenter ant problem. Good stuff by bayer. But i also found this stuff by bayer that you spray with the water hose. You can actually spray up into the trees and the yard or house. It proved to b very effective. Also used the stuff by ortho in gallon jug with sprayer. Hot Shot has this stuff "hard to find" but very good its a concentrate you mix. I used it in the empty bayer spray rig as well. If it doesnt say it kills spiders then it WILL NOT kill spiders. Remember that...and also remember if you dont keep spraying then they will come back. I didnt spray on my pest free second year and now THE SACS ARE BACK. Just alittle tidbit but this is my secret. I spray the whole yard after i rake around their hidding places. Then i wait two days and bomb the house and garage with the good stuff. The house and garage will b the first place they go to get out of the yard. Also make sure you get all your leaves up in the fall and b sure to spray before the cold weather comes. This will help thin them out alittle too. Hope this helps.

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  45. I know we have a couple of these in my house, and I just got bite by something... Not sure what. What do the bites look like?
    Cause this hurts way too much to be a mosquito nite.

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  46. i just found tons of these in my house my four year old got bit yesterday the swelling is some what gone down but a big hard bump is still there should i take him to the hospital to get it checked out ?

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  47. If the bump becomes painful, I would have it checked out, but as the swelling has mostly gone down, that sounds like a sign it is healing. So in my personal opinion, he will be okay.

    Keep in mind however, I am not a doctor, I cannot see the bite, and I am not even a true expert on spiders. This is ONLY my opinion and you need to make your choice accordingly. If it seems to not get better or get worse, and you think you should take him in to the doctor, then do so. It is always better to be safe than sorry.

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  48. I do hope the little guy is okay though. :o)

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  49. I have been searching your sight for a spider i happened upon while tearing down my parent's deck and have not found anything that matches what i saw. The Yellow Sac spider matches pretty close in shape and size but my mystery spider was completely black with subtle gray markings along the abdomen. If you could assist in identifying my find i would appreciate it if only for satisfying my curiosity.

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  50. Unfortunately, I cannot say what it might be. It is so difficult to identify a spider from someones description even if they are very detailed. This really isnt a very detailed description. Its pretty close to the Yellow Sac in shape, but that doesnt tell me how its not the same. More bulbous abdomen? Longer thinner legs? When it comes to identifying spiders with so many that can often look similar, a picture is truly worth a thousand words.

    Just taking a shot in the dark, try doing a google image search on "Common House Spiders", "Steotoda", & Black Widows. Maybe even Jumping Spiders. But keep in mind that in every one of those spiders, they can come in a few different colors and patterns.

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  51. It's funny, because these are the spiders that most old farts tend to leave alone. My Mom always called them "money spiders", and we were told never to kill them. Any other one of the harmless spiders listed on this page, of coarse, were fair game. This is an example of how dangerous it can be to listen to old people. Here you have a spider, whose venom can be potent, but they want to kill anything else. I am a vet tech, and it breaks my heart how many cats go to the shelter to die, because stupid Grandma told Mommy that they will smother babies. I would say, if you are posting on this sight, I would always disregard anything stated by your parents, and especially your grandparents, one thing that I would gamble odds on scientifically, that 98% of stuff stated by these two groups of people, that pertains to science can be tossed out the window. Unless your lucky enough to have a parent, or grandparent that is a scientist, in the particular area of discussion, they are wrong.

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    1. Haha! My grandma won't let me kill those either, and most people that I know older than 40 still think that global climate change is a lie that the liberals teach us to further their agenda. How would a push for clean energy and reduced dependence one foreign oil further the "liberal agenda to raise your taxes"?! Look at the facts, old people; you've been out of school for decades I'm sure but you can still learn without a teacher and a lesson plan. Everything about your comment is spot on.

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  52. I've got what appears to be a spider bite on my back and another on my ass and I've seen this sumbitch around the house. I even remember I woke up one morning (like a year ago) and saw one crawling up my bedpost. If I see one again I'm going to catch it in a mason jar and fill it with rubbing alcohol. Nobody bites my ass and gets away with it. Nobody.

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  53. I was bitten by two of these a few years ago, tiny baby ones. It sent me into severe shock. If they get into your bedroom, you will be a reliable food source. If you're allergic, be careful. A shallow pan with a couple inches of water and a few drops of dish detergent left beneath a night light in a dark room over night will catch many spiders.

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  54. Kimberly. Holland MichiganApril 30, 2013 at 1:29 PM

    I have always been fascinated by spiders. As long as they don't crawl on me. I currently am loving my parson spider. the one with the huge abdomen and gold tribal markings on its back. We recently purchased this home, and low and behold, the one spider I do NOT like, are everywhere. I try not to kill anything, but when I'm catching 7+ per day, and my spider is too full, I am now beyond creeped out by these yellow sac spiders. All my life I have never known them to be a nuisance. I have never liked them though. I don't mind one here or there, but this is ridiculous. I will try the peppermint oil, yes, it does work, also great for other pests. As we have animals and children. However; th Is situation is beyond the helpful peppermint oil, or the great lemon/ citrus aids. Our dog was bitten by one, he would gently play with them. was bitten around his eye and now has lost his eyesight, in both eyes. a very rare fluke, but it still can happen. Now I am going dark side, on a mission to rid the yellow sac spider from my home. just don't want to hurt any others. Do you know of a specific draw out for the sac spiders alone? This is out of control. Thank you for your knowledge. Add it was you who helped me identify my parson spider. Also all the knowledge of the sac spider. Many Thanks. :)

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  55. Talk about a bad dream! I my house in right under 2 pine trees and 50% of my rooms are yellow and the rest are a eggshell color! I see at the very LEAST, 3 of these a day in the top wall and ceiling corners, and that's on a good day when I don't have to kill 4 or 5 in just one room! I wouldn't be harmful towards them if I didn't find that these spiders are EXTREMELY aggressive and defensive, but so am I. ;D But surprisingly in the 3 years of residing in this house I have yet to been bit but still they are becoming a Huge Nuisance. I'm thinking that one of the trees if not both of their over hanging branches are going to HAVE TO GO, if not higher precautions? Anyone please feel free to offer any solutions and or advice? (OF COURSE BESIDES THE TYPICAL, "oh use our pest control services!" It's not that bad and to every natural problem there's a natural solution. Thank-You. (:

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  56. I have read online that yellow sac spiders are attracted to certain additives in gasoline. Mazda apparently had to recall over 60,000 cars because yellow sac spiders were nesting in the exhaust system. This could explain why a lot of people find them in or on their cars.

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  57. Okay, 2 or 3 I could handle, but two nights ago I came home to find SEVENTEEN just in the kitchen! And I have a tiny kitchen, maybe 5' by 8' and that's being generous. Those ones were just hanging out on the ceiling and in the crack where the ceiling meets the walls. They hide in our nightlights, under the lips of laundry baskets, and in the slats of our spatulas. Creepy! I have an 18 month daughter and they make me so paranoid I check her room at least 3 times before I go to bed. They seem to prefer the main floor, but they will go upstairs if left alive. They are worse in spring in my house and this is the worst year we've had (only lived in the house 3 years so far). We have high ceilings and I'm too short to reach them. I literally get goose bumps every time I walk into the kitchen :(

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  58. i live in menominee michigan and i have been sucking up these yellow sac spiders with my vaccum during the day or knocking them down with a broom and squishing them at night for about a month so far, but after riding the whole house of spiders and even all of their den-like webs within hours i have another dozen or so, and until i read this i didnt think much about them accept the regular creepy crawly feeling i get from any bug, but i have been unlucky in my life to always get severe allergic reactions to bugs, mosquitos and such, i have given up hope that they will stay away for good so i will just keep on being the spider killer of the household, (and i am a girl) but i was wondering is there any way to keep them away from me while im sleeping? or maybe just away from my room in general?

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  59. Yellow Sac Spiders do indeed like to infest a house. There are certain trees that they like and if the tree is near the house, it can lead to the infestation. I personally try not to park my car under trees for just that reason. Nothing I like less than seeing one of these in the car while driving. lol

    A couple ideas you can try.

    1) Cover any vents and openings with cheese cloth and caulk any cracks or spaces where the walls dont meet the floors right. If you have them in the basement or attic, they could be crawling through vents and such to get into other rooms.

    2) Get some Ortho Home Defense from somewhere like Home Depot. It comes in a gallon jug with a small hose and a squirt gun attached. Spray it outside, creating a barrier around the windows and doors. This works well if you do it every month or two, but it only keeps them from coming inside. It does not do anything about the spiders already inside. I dont know about spraying inside. You will have to read the instructions for that.

    3) I do not know that this works, but I have a little reason to believe it does. Mixing coconut oil with white vinegar in a spray bottle, and spraying it in all the corners and crevices in your home. This is supposed to rid your home of spiders. I am not sure of the mixture amounts. I believe it is one cup of white vinegar and one TBS of Coconut Oil. Someone sent me an email at work on it. I will have to wit til I can check that.

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  60. Kenneth, I have a picture of what I believe is a yellow sac spider, which have been all over my home. I have a small fully disabled child and am very nervous about them getting to her, since she cannot talk and can only lay or be carried. is there an email that I can send this picture to you to verify if this is indeed the spider?! thank you kindly in advance for any assistance!

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  61. Sorry. I did not see this comment until now. There is an email in the middle of every page near the top for people to send me pictures and ask whatever questions that come to mind. If I know the answers I may even answer them. ;o)

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  62. I woke up yesterday morning with a bite on my lower back. It was hard and red in the center and very sore. My husband confirmed it was indeed a bite, as it felt alot like a bee sting. This morning, the swelling has gone down quite a bit, but it is still very sore and my husband says it looks like I scratched it open. But i hav not touched it, and it does not itch. I also woke up with a bit of an upset stomach. I plan to go home after work and get the shop vac out and terrorize all the webs I can find. I also plan to wash my sheets, as I think that is where he bit me. I don't think this is quite worth a trip to the doctor, but I will monitor it carefully. I know I have seen these guys around the house, and we live in the woods surrounded by many kinds of trees. Which trees do they tend to prefer, if you know. I am also going to have a chat with my kitties, as it seems they have been focusing on larger prey and neglecting their duties!

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  63. I myself have captured one with a green abdomon. it is very interesting when it is weaving itt's web. it commonly weaves it into a tube, but then when it wants out, it destroys it. I have kept it in a glass bottle, and I feed it live bugs. it likes to eat smaller bugs whole, and bigger ones, it sucks the blood out of. It never wraps its prey in a web, it just finds it, injects venom, and eats it!(or sucks the blood out of it.) it has long legs that are very transparent. very interesting indeed!!

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  64. I am the person above, and that one has escaped. I have caught a spider with a gren abdomon with red legs. please tell me if this is an uncommon yellow sac or if it is another type of spider ASAP!!

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  65. I see in your description is says: "On the rare occasion the bite can result in chills, fever, headache, dizziness, nausea, anorexia, and sometimes shock."

    How exactly does it cause anorexia? I'm going to assume that's a mistake, if not please explain this one.

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    1. I would have thought the same thing if I had never seen the true definition for anorexia, which is "a lack or loss of appetite for food (as a medical condition)."

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  66. I see these in my house all the time, or at least I think it is this one. They are yellowish like this in color, and not very large. I have never been bitten, but I probably kill 1 or 2 a week.

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  67. Can the be all whit with a very tiny hit of green almost like their glowing(but not of course)?

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  68. I have gotten bite by what I'm now sure of as a yellow sac spider in my armpit that was well over a month ago and I've tried everything to heal this but its just a ball under my skin that I can "pop" every few weeks and puss comes out what do I do??? My sister told me to get drawing salve and use it

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  69. I absolutist dislike spiders. If they're outside, ok. But in my home not so much. I've found several of these, at least I'm sure, in my home last fall and this fall. I only researched them more since finding a rather larger one crawling on my clothes in the bedroom where my toddler and newborn sleep as well. It is unsettling to think we *could* get bit. Is there anything I can do to keep them out of my home? I've also spotted many of them on my porch at night too.

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  70. Just read an article that the yellow sac spider loves the smell of gasoline. It has caused Mazda to recall some autos because the spiders were building webs in engine ventilator systems. This is why so many people find them in their cars.

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  71. My wife seen one of these in the car I tried to kill it it kinda curled up and though it was dead I was around my pants a couple hours after getting in the house I layed down and got bit in the back about four times welts are big and painful and itch one bit is OK I can live with that but it got me a couple times and they itch badly. Hoping to stay out of the e.r do have a doctors appointment Thursday if it don't get better I should have left him alone in the car but she was driving and seem to not like him very much..

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  72. How do I get rid of these? I HATE spiders. I have seen a couple in my toddler's bedroom at night. I find at least 5 in my kitchen every night as well... so gross.

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    1. As with any spider, if they are coming in from outside, get some Ortho Home Defense from somewhere like Home Depot. A gallon jug comes with a small hose and a squirt nozzle attached. Spray a barrier outside around the windows and doors about once a month or two. As for inside, I am not sure how that stuff works. You will have to read the label to see if it is safe.

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  73. I am very sorry for this, but I have recently learned that I had found some bad information about the Yellow Sac Spiders. They do not in fact use the same cytotoxin as the Recluse. The recluse venom is much more dangerous than the Sac Spider for multiple reasons.

    I do believe they can still cause an open sore to develop, but I have reasons to believe it is not as bad as I first thought.

    Once again, I apologize for the bad info. There is a lot of bad info on the net, and in this case it came from someone with credentials, but lied to cause a stir to gain interest in order to get funds for his research. It was Rick Vetter, who is the top Recluse Expert, who corrected me and filled me in about the background of the bad information.

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  74. I was bitten by a yellow sack spider a few weeks ago at night while I was sleeping. The next morning it itched like crazy & started to swell up. I also started to feel ill so I called my Aunt who is a Nurse. She recommended I soak it in Epsom salt to draw out the toxins & see a Dr if I felt worse.

    The following day it swelled up immensely & I started to feel incredibly ill. I was experiencing pain when walking, muscle spasms, extreme nausea, sweating and confusion so I went to the ER. The area swelled up immensely where I was bitten on my ankle. It was red & started turning purple towards the center. It felt like I had the flu kind of except it was causing some confusion as well along with muscle pain & spasms. It swelled outwards several inches & covered 3/4 of my ankle expanding around the sides.
    They prescribed strong antibiotics & prescription medications for the swelling. I continued to soak it in Epsom Salts & apply Neosporin to the area along with taking the antibiotics & Ibprophen.

    It has been a few weeks now & I'm still waiting for it to heal completely. It looks so much better now. Every day I soaked my ankle in Epsom Salts to draw the venom out & applied Neosporin antibiotic cream. The sore is still there but it isn't swollen & it has scabbed over now.

    I was also bitten by a Brown Recluse when I was 14 yrs old which ironically didn't make me feel as bad as I did when being bitten by a Yellow Sack spider. Although the Brown Recluse bite did necrosis this one has not. I still have a large scar from the bite about the size of a quarter. As far as pain & how sick I felt I felt worse from the Yellow Sack spider. I did feel ill when bitten by the Brown Recluse I just didn't feel as sick as this time when bitten by the Yellow Sack spider.

    I had a very difficult time locating the spider. She had been hiding out by an air vent. I finally found her because she had built a nest up in the corner between the wall & the ceiling. I had an incredibly bad reaction to being bitten. It looks identical to your picture above.

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  75. We get these every year and I am the only one in my family who seems to get bitten by them in my sleep :(. Every spring/ summer I run around the house at the first sign of the large black spiders ( I know what these hungry little guys are around for) or upon the sight of the yellow sac webs. I am borderline neurotic trying to remove them from the house and inevitably am bitten any way. My very lucky husband sleeps undisturbed. Could they be attracted to a hormone or heat I am putting off?? I Can not figure out why they do not wander over to his side of the bed.

    On monday of this week I woke up with 17 bites spreading from my leg to my torso. They start like a mosquito bite and within a day end up the size of a quarter, pussy, and itchier than anything I've ever known. Determined to let the bite run its course and attempting not to scab and scar this year I left the bite as un scratched as I could for two days, but now they are seeping, itch and hardening. I am wondering if I am allergic, because anyone who sees the bites comments, "what happened!" In my experience they are not mild at all, they are very uncomfortable and can last weeks:( ! After removing all of my bedding and vacuuming the bed frame I went to bed on Wednesday night only to wake up with the total bites equalling 35 !! I am loosing it. I am cleaning like a mad woman and am nervous to go back to sleep as it is not helping. I can not see any webs I am washing the bedding (pillows, sheets, everything) and can not seem to catch the little buggers. Any Thoughts about why they are singling me out, what is causing the crazy reaction, and how to remove these bastards when I can't seem to find them this year? I am in SE Michigan. Thanks for any advice.

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    1. I think I would have to question if they are positively spider bites you are getting. If you do not actually see the spider that bites you, or feel the bite, but you wake up with the bite in the morning? Go to a doc and have him do a culture test or something.

      The reason I say this is because spiders really dont bite people as often as people think. The far majority of supposed bites we wake up with are not bites. Our bodies sometimes have toxins it needs to dispense and will do so out through the pores and such. It will look like we were bitten by a spider when in fact we are not. That is only one possibility. There are infections, allergic reactions and many other things that can cause spider-bite like sores.

      So maybe you are not being bit by a spider, but have something a doctor might help you fix and you wont need to worry about it anymore. Maybe drink joices that have good antioxidants or something?

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