Bifen IT has a residual of 90 days indoors and 30 days outdoors. Repeat application should only take place if there are signs of renewed insect activity and must not exceed one application per 7 days.
Please view the product label for listed insects and more information.
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.