Jay from Southampton, Nj writes
Gentrol IGR Concentrate is labeled to treat for Drain Flies however will not kill exisiting drain flies. IGR’s only stop the immature stages of the insect from maturing into adults and reproducing. Per the product label for drain treatments, apply product into and around the downspout and catch basin area. Coat these areas thoroughly as fly larvae develop in the scum buildup on the sides of drain pipes. Repeat applications at 2 to 4 week intervals depending upon the severity of infestation. We would recommend using our Drain Fly Kit in addition to Gentrol IGR for a complete treatment program. For more information please reveiew our How to Get Rid of and Kill Drain Flies
Answer last updated on: 08/05/2021
