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Bifen IT is labeled to treat for clover mites when used accordingly. Clover mites are barely smaller than a pinhead. You may notice clover mites as dark red moving specks which occur in large numbers. They are generally found crawling aroudn doors, windows, sidings, curtains, or furniture. Be sure to treat the ground at least 5-10 feet from the structure where you are seeing the clover mites.
When using Bifen IT to treat for soil dwelling pests such as sob webworms, the rate is not per gallon of water but per 1000 sq ft as you would use sufficient water to cover the target area and get the product to the pest. Per the product label: To accomplish uniform control when applying to dense grass foliage, use volumes of up to 10 gallons per 1000 square feet. You would use 0.18 - 0.25 fluid oz. per 1000 sq. ft for sod webworms. Higher treatment rates (up to 1 fluid oz. per 1000 square feet) may be necessary if high pest pressure exists and if the grass is maintained taller than 1 inch.
In general 1 gallon can cover 1000 sqft but for sod webworms the amount of water needed could be higher depending on the grass foliage, equipment used, how fast you walk, etc.
As long as Bifen IT was applied as directed on the label and watered in as required for chinch bugs (at least 0.25 inch of irrigation) after application, you can go ahead and water in the fertilizer. It will not move much farther into the soil as it is designed to bind to the soil. If more water was used that would just have pushed it down into the soil better and will be fine.
You should dethatch first and then treat with Bifen IT for increased effectiveness. You should water in the product after application to reach the areas they feed.
Yes, Bifen IT is labeled for roaches and will kill them. This product is not recommended if you have an active infestation of roaches. If you see an occasional roach, this can be used indoors and outdoors for control. The mixing ratio is 1 fl oz per gallon of water.
Also, please check out our Roach Guide for tips on how to treat and prevent roaches.