Kevin from West Salem, Wi writes,
I need an alternative for Cyper WP and not Demon WP. I mix 50 gallons at a time for dairy fly control and the packets are not cost effective. I have used Bifen but have had a short residual. I am needing to make my spring order. Thanks much!...
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