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Bifen IT

Bifen IT

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Andrea from Atlanta, Georgia writes,

What is the minimum time that should pass before re-spraying Bifen IT for mosquitoes?

We have sprayed 3 times this summer for mosquitoes and the Bifen IT has not gotten rid of them nearly as well as it did when we used it last summer. We just sprayed 6 days ago and still have quite a lot of mosquitoes. Can we re-spray yet? Also is it possible that the Bifen IT has lost it's potency in one year?


Bifen IT is recommended to use once every 30 days outside for Mosquito control. Depending on the weather conditions(rainfall), this could affect your results. For best results, allow 24 hours after outdoor application before expected rainfall or watering. When applying, focus on the underside of leaves on bushes, shrubs and trees as this where mosquitos will hide during the day. For a quick knockdown mixing a Pyrethrin concentrate with the Bifen IT will give you immediate relief. Mix 1oz ExciteR and 1oz Bifen IT in 1 gallong of water. With this combination, you get the quick knockdown and the residual for 30 days. Mixing Bifen IT at the lower mixing rated of .33floz you can apply higher volumes to ensure application of the proper amount of product to a given area or you can mix Bifen IT at the higher rate of 1oz per gallon of water for a longer residual and a quicker knockdown. If there are areas where there is standing water, using the BTI Mosquito Dunks will help.

Answer last updated on: 09/25/2014

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