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Entomology (Study of Bugs)/Bug that leaves behind little black spots


kc wrote at 2010-11-06 18:50:41
I have the same problem. I think the person was asking what kind of bug leaves behind these residue spots not what kind of bug leaves a black spot when it is smushed. I have the same thing in my bathroom right now. Strange tiny clusters of black spots that only come off with soft scrub,

Nita wrote at 2012-07-31 19:20:26
I have a similar situation.  The bug was very lethargic, so I was able to swat it and kill it without smooshing it very much.  It was in the bathroom sink and looked much like a roach, but I have no infestation of them.  I had noticed blackish/bluish stains in the sink for a few days prior.  If it was a roach, it may have been in some boxes I had in my home briefly.  But not sure what type of bug it was.  The stain did not come after killing it - it came prior to that.

Deborah Whitt wrote at 2014-12-24 14:17:00
I  thought the black spots on my siding was from spiders also, but I read that it was a fungus from rotting wood or mulch which is rotting wood that was the culprit.. It read that this fungus shot spores up toward the sun as high as 20 ft. The best way 2 rid the problem is 2 get rid of the mulch & use something else such as rock.

Entomology (Study of Bugs)

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Doug Yanega


I`ve been studying entomology for some 20 years, and I`ve been answering questions about insects on the net for nearly a decade now, and am familiar with virtually all groups of insects, both in North America and elsewhere. My greatest expertise is with bees, but I also work with wasps, flies, beetles, butterflies, and moths. If I don`t know the answer to a question, I can generally direct folks to a book or person who *can*. But no spider questions please, I don`t do arachnids.

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