David writes
I saw on the label it said it will kill "biting gnats" but I just wanted to ask about the no-see-ums specifically. Does the chemical leave a residue behind that will also repel the gnats also or just kill it if they land on it?
Onslaught will kill no-see-ums, however as you hinted any gnat or flying insect will only die if they land on a treated surface and pick up the product on their bodies. Unfortunately there is no product that will repel gnats or flying insects short of placing a huge net over the house.
Answer last updated on: 03/19/2011
