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Bifen IT

Bifen IT

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T. from Leesburg, Fl writes,

I'm applying Bifen IT and it doesn't kill the fleas!

Ive fenced a 400 sq ft area for my dogs, pick up droppings everyday, grass is consistently wet/damp…I'm applying 1oz to a gal and expending the entire gallon in this small area…and it doesn't work! Dogs are treated using Advantage but they still get fleas…help!


Bifen alone will not eradicate fleas. You will also need to mix in an IGR to break down the reproductive cycle. Bifen kills the adults that come in contact with it, but then you still have the immature fleas growing and then reproducing. It is a constant battle without the IGR. We recommend Nyguard as it will last up to 7 months. 

Answer last updated on: 03/16/2015

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