Permethrin SFR 36.8% Annual maximum for lawns

Easyluck · Jul 17, 2019

There is a lot of information on the permethrin label and I'm trying to figure out what the annual max is when applying to lawns.

For reference here is the label.
https://www.domyown.com/msds/Permethrin_SFR_Label.pdf

1) page 1 - "Contains 3.2 pounds permethrin per gallon as an emulsifiable concentrate."
So 3.2 pounds / 128 ounces = 0.025 pounds AI per ounce?

2) page 37 - "Lawns: Mix 0.4 - 0.8 fl. oz. of Permethrin SFR in 4 to 25 gallons of water per 1000 square feet. Use the higher rate for fast knockdown and increased residual control."

3) page 38 - "Do not apply more than 2.0 lb. a.i./Acre/Year."
So 2 pounds / 43,560 square feet x 1000 = 0.0459 pounds of AI per 1000 annual max?

If I use 0.8 oz per thousand then that contains 0.02 pounds of AI? If correct then I can only use the max rate (0.8 oz/1m) 2 times per year.

Is this correct?

Easyluck · Jul 22, 2019

Can anyone confirm if I am converting pounds of AI to an annual max per 1000 sqft correctly?

Austinite · Jul 22, 2019

That's correct and Martins (the manufacturer) is on the extremely cautious side of things to prevent any potential backlash to the company. Permethrin in general lasts about 5 weeks. Less than that when sprayed on turf grass. I apply it every 6 weeks to the lawn and the rest of my house. Zero issues whatsoever.

Easyluck · Jul 22, 2019

Austinite said:
That's correct and Martins (the manufacturer) is on the extremely cautious side of things to prevent any potential backlash to the company. Permethrin in general lasts about 5 weeks. Less than that when sprayed on turf grass. I apply it every 6 weeks to the lawn and the rest of my house. Zero issues whatsoever.

Thanks @Austinite!

Edit: For future reference: The annual max per 1000 sqft of Permethrin SFR 36.8% is 1.836 ounces when using a broadcast application on lawns.

Permethrin SFR 36.8% Annual maximum for lawns

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