There are a few ways to keep the number of gnats down. You can invest in a misting system that periodically sprays a pyrethrin insecticide in your yard. This system is a lot like a sprinkler system. We do not carry the actual mister system but we do carry the insecticide that is used in it called Riptide. If you want to get something you can just spray you can try Talstar P. Gnats that land on the treated areas will be eliminated. Talstar P will not repel the gnats from the area nor will it kill the gnats that do not land on the treated areas.
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Bifen IT is labeled to treat for clover mites when used accordingly. Clover mites are barely smaller than a pinhead. You may notice clover mites as dark red moving specks which occur in large numbers. They are generally found crawling aroudn doors, windows, sidings, curtains, or furniture. Be sure to treat the ground at least 5-10 feet from the structure where you are seeing the clover mites.
As long as Bifen IT was applied as directed on the label and watered in as required for chinch bugs (at least 0.25 inch of irrigation) after application, you can go ahead and water in the fertilizer. It will not move much farther into the soil as it is designed to bind to the soil. If more water was used that would just have pushed it down into the soil better and will be fine.
You should dethatch first and then treat with Bifen IT for increased effectiveness. You should water in the product after application to reach the areas they feed.
Yes, Bifen IT is labeled for roaches and will kill them. This product is not recommended if you have an active infestation of roaches. If you see an occasional roach, this can be used indoors and outdoors for control. The mixing ratio is 1 fl oz per gallon of water.
Also, please check out our Roach Guide for tips on how to treat and prevent roaches.