When applying Bifen IT for fall webworms or other ornamental pests, use 0.125-0.25 ounces of concentrate per 1,000 square feet, or 5.4-10.8 oz. per 100 galons of water for high volume applications. See the product label for complete application instructions.
You should contact your local cooperative extension office to find out the best time to start spraying a product like Bifen IT in your region. They are more familiar with the timing of insect activity in your area. We can say that it should be applied monthly through the beetles active months.
Bifen IT is mixed at 1 oz per gallon of water per 1,000 sq ft.
We would recommend using Hi Yield Indoor/Outdoor Permethrin 10% Insecticide. It is safe for use on edibles and is labeled for mosquitoes. The mixing ratio is 1-3 oz. per 4 gallons of water. This will treat approximately 4000 square feet. This can also be used in your lawn for mosquitoes as well.
Bifen IT will effectively get rid of mosquitoes that can spread dangerous diseases like West Nile, the Zika Virus, etc. It is mixed at 1 oz per gallon of water per 1,000 sq ft once a month on the exterior areas. Please take a few moments to review our treatment article on How to Get Rid of Mosquitoes for a successful control program.