Currently viewing the category: "Grubs"

Hello! We could really use some help identifying the two bugs below. They were found beneath old logs in Southern Kentucky. Thanks!
Heather Allen

Wireworm Flatbacked Millipede

Hi Heather,
Because today is a California Holiday, C

Update:  May 10, 2015
Today while searching our archives for Wireworm images for a new Wireworm posting, we came across this truncated posting that probably occurred when we did a major site migration many years ago.  At any rate, Wireworms are the larvae of Click Beetles in the family Elateridae.

I have never seen anything like this befor here in Michigan.
Evan Owens

Hi Evan,
Please give us some context. Did you find it in the bathroom? We don’t think so. Did you find it in the pantry? We don’t think so. Was it crawling across the driveway? We don’t think so. Was it eating the leaves on your rose bush? We don’t think so. We believe it was found in a wood pile. This is the Grub of a Beetle in the Family Cerambycidae, the Long Horned Borers. They spend their lives feeding on wood, pupate inside the stump and emerge as winged adults.

Dear Bugman I found this bug (Wood Boring Beetle Grub) in the yard and it’s all sand I was working in Rosscommon on a house in the woods but about 1 acre of it is all sand where i found it .no grass and no wood pile and no wood in the imediate area, but was close to the driveway. Thank you again for your help.

Hi again Evan,
We have a new theory. Perhaps the grub was living in cut lumber. There are species that can emerge as winged adults years after construction.

We stand chastised
(09/30/2005) Hi. My friends and I read your site daily to look at all the fastinating new bugs. We were quite dismayed with your reply to Evans Owens who sent you a picture of the wood boring beetle grub. Were you courteous? WE DONT THINK SO. Were you pleasant? WE DONT THINK SO. Were you nice? WE DONT THINK SO. Were you polite? WE DONT THINK SO. We think that since you are in the “public eye”, that you should not chastise the people who write to you for help. What good really would it have done if he told you where he found it? On July 17th, this year, Dave and Wendy told you they found a pseudoscorpion in a box of cereal. Did that help you identify it? WE DONT THINK SO !!!

Hi there, This wasn’t meant as a discourtesy as much as it was meant to comment on the lack of information in the query. We stand chastised and will post your comment beneath our original response. At least we didn’t use email shouts in our response which was actually meant to be funny. Occasionally a joke will fall flat. We hope our unintentional rudeness hasn’t cost us a reader. We still love the letter with the Pseudoscorpion in the cereal, and in actuality, we did identify it.

Evan Responds: (10/01/2005)
Sorry everyone took it as rude, I took it as funny, As in, where did you find it? I did not feal insulted or put down in any way. I guss I should of put LOL after I found it by the driveway , (LOL) But I also appreciate the concern of your readers, And I thank them too. The home is over 10 years old and it’s a modular home, And the wood is all treated lumber that we where using, so how it got there is beyond me, and your guess is probably better than mine (LOL) and there is about 100 acres of woods there . P.S. im not in to bugs much, but i do like to know what it is im looking at when i do see one I’ve never seen before and im glad I found your website, I now have it saved in my Fav. websites. and I thank you for your help.

Additonal Information
(09/30/2005) Evan Owens Ash Borer
Hello Bugman,
I’ve been appreciating your site for some time, since ID’ing a Great Golden Digger Wasp flying around hoarding Katydids in my wife’s flowers, and regularly click on it to see what’s up on your main page. Thanks for the work you’re doing. I’m just writing to shed a little light on a picture on your main page. I’m from northern lower Michigan and the boring worm that Evan Owens on 9/29/05 has pictured is an import that is giving the forest service around here fits. Since it is a newcomer to Evan, it is likely an Emerald Ash Borer grub, and it kills trees, specifically Ashes. Southeastern Michigan has had its parks and woods practically culled (an estimated 8 to 10 million trees since their introduction in 2002) of Ash trees over the past few years, and the insects are continually spreading as people move firewood (containing the voracious larva) to northern and western campsites in our state, Ohio, and Indiana. If Evan, or anyone else that spots them, is outside the known range of these pests, Michigan has a hotline for reporting their spread and disposal sites for infected wood (866-325-0023.) Michigan also quarantines areas and bans the transporting of firewood but the rules are all but unforcible. The best tool right now for stopping them is early detection and eradication, but that will only come with education. For further information, here are some very informative links that include pictures of the insect, where it came from, and efforts to contain it:,1607,7-125-1568_2390_18298—,00.html
I know your site isn’t dedicated to removing pests, but this is one exotic that could use the boot.
Weston Tulloch
Bay City, MI

Thank you for your insiteful letter Weston. One comment we would like to add is that many Wood Boring Beetles have similar appearing grubs and this might actually be a native species. We also stand by this being a Cerambycid and not a Buprestid which the Emerald Ash Borer is. Cerambycid grubs have much larger heads.

Here are several pictures of invertebrates that my wife has taken. She is a sales rep for a company that sells garden products and she uses the pictures to train garden center employees to identify local pests. First, is a grub I found in my front yard here in Vancouver, Washington. It was about an inch long. My wife doesn’t know what it is. Any ideas?

The next two are photos of a slug, one in front of a measuring tape. Nearly 10 inches long! What a beaut. The last two are European crane fly, in the adult and larval stages, respectively. Just something to add to your collection.

Wow Evan,
Thanks for all the awesome images. We are starting a new page devoted to snails and slugs thanks to your great images of a Banana Slug. We aren’t sure exactly what your grub is, but it is a type of scarab. We love the image of the larval Craneflies, known as Leather Jackets.

Grub? But the Size?
We found this LARGE grub like thing while cleaning out a junk area in the yard. Can you tell us what it is? And what it may turn into?
Jason Wilson
Austin Texas

Hi Jason,
You have a large Scarab Beetle grub, possibly one of the June Beetles. June Beetle grubs live in the ground and feed on the roots of grasses and other shrubs. Some Scarabs get quite large as both grubs and adults. Sorry I can’t provide an exact species name for you.

Hi Daniel,
I’m having an ongoing problem with what I’m told are grubs in my St. Augustin grass. Each summer I get these patches which turn yellow/ brown and die out, just as if I hadn’t watered them in ages, which is, of course, not the case. Apparently they eat the roots of the grass causing the tops to die. I have usually spread grub killer and that seems to take care of it. The problem is that the grub killer, called "Seven," I believe, is super toxic, indicating the need to wear socks, long pants, gloves, respirator (my addition), etc. Do you know of any similar remedy for grubs that would not be so environmentally horrendous? I have three cats who live in this grass daily and I don’t want one of them to start growing an extra head or some other such gruesome mutation. Caroline, a Manx, already has all the extra toes she can handle.
Kathleen (a.k.a. Toxic Avenger)

Dear Kathleen,
I can think of three possible culprits for your St. Agustine grass problem, the likliest one being the chinch bug, Blissus insularis, small gray-black insects that suck plant juices from grass blades, especially St. Agustine grass, especially in hot weather. To confirm chinch bugs, according to the Western Garden Book , push a bottomless can into the soil just where the grass is beginning to turn brown. Fill can with water, If lawn is infested, chinch bugs will float to the surface. Diazinon and chlorpyrifos are chemical controls. According to Hogue, the Southern Chinch Bug feeds on several grasses, but Saint Augustine is by far the preferred host plant. The insect’s feeding may cause considerable damage: the grass becomes dwarfed, turns yellow and then brown, and dies. Because of the tendency of the species to form aggregations, the symptoms of attack are usually visible in scattered patches. The species is not a native. It first appeared in the Los Angeles area in the late 1960’s, having come from the southeastern states. It produces two generations per year and is most abundant in midsummer. Two additional possible culprits that require the same chemical control are Sod Webworms and beetle grubs. If you see whitish to buff colored moths flying around the lawn in a zigzag pattern at night, check for their larvae. To confirm Sod Webworms, drench area of lawn with a solution of 1 tablespoon dishwashing soap diluted in 1 gallon of water. Larvae will come to surface. Treat if there are 15 or more webworms per square yard.

Dear Mr. Bug Man,
These live in my compost pile. They seem to be good for the decomposition, because they eat the contents of the pile and excrete them in a much-broken-down-form. But: what the hell? Big as my pinkie. Jerusalem Cricket?
Sean Dungan

Dear Sean,
Despite the suspiciously similar appearance to the killer "graboids" from the movie Tremors, your grub is just a grub, in this case the larval form of the Green Fruit Beetle (Cotinus mutabilis). Any observant insect watcher in Southern California, Arizona or Mexico has surely seen these enormous metalic green scarabs which take flight in August and September, buzzing noisily and circling clumsily in their search for fruit, namely figs, peaches, apricots, nectarines, grapes and cactus fruit which is the wild host plant. Originally native to Arizona and New Mexico, the beetle has moved west and is now relatively common in the Los Angeles Basin. Eggs are laid in compost piles, and the grubs, which can reach 2 inches in length, are sometimes called "crawly-backs" because of their method of locomotion, which involves undulating the body and pushing against the substratum with short stout bristles on the back of the thorax. The grubs feed on decaying vegetation, and are beneficial to the compost pile.