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Jim from Madison, Al writes

Is Permethrin SFR 36.8% yard spray safe for cats after it dries?

I asked a veterinary toxicologist if it is safe to use permethrin on my lawn with 6 cats. He said yes, as long as the concentration does not exceed 1% and it properly dries before I allow the cats outside. I takes 3 gallons to spray the 3000 sq. ft. lawn. I'm planning to use 2 ounces of 36.8% permethrin in the FULL 3 gallon container (0.67 oz. per gallon). I estimate this will apply a total of 0.74 oz permethrin on the entire yard (0.25 oz. per 1000 sq. ft.) or 7 mg / sq. ft. and the spray concentration would be 0.5% permethrin (half of the 1% recommended). I'm confident this is safe for my cats. The question is: Is it strong enough to kill fleas and other insects?

Answer:

In this case you can use the Permethrin SFR 36.8% at the .5% to the 1.0% based on the label with is (.5%) 1 2/3 oz  - (1.0%) 3 1/3 oz per gallon of water. This usage ratio would keep you within the 1% mixture rate. This would be enough for fleas and other pests outdoors depending on the weather condition (amount of rain, UV rays, etc). You do want to be sure the pets are completely out of the area while you are spraying, and until the product dries.

Answer last updated on: 08/22/2016

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Permethrin SFR 36.8%

Permethrin SFR 36.8%

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