Flying small insects

Hi, I have a problem with these insects. They are primarily in our unfinished basement area. They are all over! They like light and water. We can not find a definitive point of entry. Pest control was here and they too cannot find where the source was they use Gentrol and another type of cleaner along bottom of the wall, window and drains. Plumber came and cleaned out sump pump and covered it tightly. We do have a crawls space but can’t find any concentrated location. All
household drains have been cleaned.
Any help???

 

Welcome to the forums.

That is some super magnification. Those look like what we call fruit flies. They typically are found around rotting or older fruit. Typically one appears and then they start multiplying. I have been seeing more than normal in my home.

I was on a job today and sitting in the cafeteria and they were on the table. Apparently the heavy rains have been causing an increase in rotting vegetation and they are multiplying rapidly.

In small quantities they are easy to trap. in the link is a typical method with vinegar and dish soap.
Save the fruit fly

 

Thanks for the reply. I tried that and they did not go around it,. I’ve put fruit out purposely and they didn’t go around that. It has rained a lot and this wall is an outside wall along our foundation.

 

I need to see in focus pics of an individual insect(s). The one included is fuzzy and too close up. Back off a little, until details come into focus.
Meanwhile, search images of "psychoda" also known as sewer flies and see what you think. They look like tiny moths.
What did pest control ID them as? Gentrol is an insecticide, specifically an insect growth regulator that targets the larval stage only and must pretty much be targeted at the source.

With small fly species, where you find the greatest density is where the source is, generally speaking. The drains upstairs, etc aren't causing the problem in the basement.

Proper ID is paramount to solving any fly problem, especially the smaller species like this.

 

 

Good pic. Not psychoda (sewer fly). I suspect it is the sphaerocerid or dung fly, though not 100% sure, certainly. Inspect closely where the sewage pipe exits the basement; does the density of the flies seem greater? Does the wall seem damp there? A pipe break just outside the basement wall can cause this issue. In any case, there may be decomposing organic matter inside or just outside the basement.

Before the sump pump was covered, were flies/larvae noted in the sump?

If in that process, or the other cleaning processes, the source was removed then the density of adults should be diminishing. Do you have a feel for if the adult population is increasing/decreasing/same? Are you seeing larvae, which would be maggot like worms? If so, then the source is close by.

https://www.maheu-maheu.com/pests/Sp...Small-Dung-Fly