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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!

Answer:

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

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