Vaman from Naples, Fl writes
You can apply Bifen IT indoors and outdoors for flies in general as long as you make sure none of the spray winds up in the lake. If contaminating the lake is a concern for you there is a product called Essentria IC3 that can be used around water without worry of hurting any aquatic life. Essentria IC3 is a broad-spectrum natural insecticide that works just as well as the synthetic insecticides but without the aquatic toxicity issue.
Answer last updated on: 11/28/2016