Kevin from West Salem, Wi writes
Most liquid concentrates will offer an outdoor residual of 30 days and indoors for 90 days. Bifen IT is the most economical choice for the application. Permethrin SFR is a broad spectrum insecticide that offers a quick knockdown of target pests. It has the same residual time as Bifen IT but is labeled to be applied to dairy cattle (lactating and non-lactating) for fly control.
Answer last updated on: 04/24/2015