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Entomology (Study of Bugs)/What are those insects, frass and holes?

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QUESTION: I live in Orange county, South California and have those insects, frass and holes inside my house. They are 2 types of holes: small round holes  2, 3 together like nail hole and big hole ( big nail) just one on each room. The frass are very difficult to clean, some have color. Please help.
Thanks,
Sorry, will upload more image.

ANSWER: Danny,

These are cockroaches, see http://www.livingwithbugs.com/cockroaches.html for general information about roaches and roach control. Since cockroaches don't make holes in walls so I can't help there. Cockroach baits are the best control, sprays don't work very well. There's a list of professional baits on the page cited above. Post a follow up if you have questions.

Jack DeAngelis


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QUESTION: Thank you. Here are the other 2 insects and the holes pictures. What kind of insects that can create those holes.Will follow with the frass.

ANSWER: The image "insect 2" is a moth (left) and a carpet beetle larva (right, see http://www.livingwithbugs.com/carpet_beetle.html for more pictures). Neither of these make holes. The holes pictured in the image "holes" don't look like typical emergence holes. Emergence holes made by insects are generally round, these are irregular in shape. I don't think these holes were made by insects.

Jack DeAngelis


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QUESTION: Here is another pictures with holes.  As you mentioned, i have hole that is rounded.In one week they create a lot of holes in same place. Round and irregular. Still upset.Please advise
Danny

Answer
Again, I don't think these are caused by insects. Several of the holes appear to have chips broken out of the surface. Insects such as powderpost beetles make smooth, circular holes, they would not make irregular chips in the surface. If you are still concerned you might spackle the holes then paint the wall. If new holes occur in the same area this would possibly indicate powderpost beetles (see http://www.livingwithbugs.com/powderpost_beetles.html for pictures).

Jack DeAngelis  

Entomology (Study of Bugs)

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Jack DeAngelis

Expertise

I can answer questions in any area of entomology (study of insects, spiders, mites, ticks, and other terrestrial arthropods). Contact me about home and garden insects, insects that bite and sting, and insects that damage homes such as carpenter ants and termites.

Experience

20 years as university extension entomologist, now retired; currently publish a website about home and garden insects.

Publications
see www.livingwithbugs.com/resume.html

Education/Credentials
Ph.D. in Entomology

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