http://msucares.com/poultry/diseases/pesticides.html
Listed below are several chemicals that have been approved for treating various poultry pests. Regardless of the chemical used in the poultry house, follow all precautions listed on the label to prevent the possibility of health risks to the poultry or humans.
Permethrin
5.7% EC Spray -- Dilute 7 tsp/gal or 1 qt/25 gal for .05% solution
-- Dilute 4 1/2 Tbs per gallon for .1% solution
10% EC Spray -- Dilute 4 tsp/gal or 1 qt/50 gal for .05% solution
-- Dilute 2.5 Tbs/gal or 1 qt/25 gal for .1% solution
11% EC Spray -- Dilute 3.5 tsp/gal or 1 pt/25 gal for .05% solution
-- Dilute 7 tsp/gal or 1 qt/25 gal for .1% solution
25% WP -- 1.5 tsp/gal or 1 pt/30 gal for .05% solution
-- 1 Tbs/gal or 1 pt/15 gal for .1% solution
The .1% solution is applied to ceilings, walls, and suspended objects using a pressurized or power sprayer. This residual spray may remain effective for several weeks unless removed by washing or rain.
The .05% solution can be applied directly to the birds at the rate of 1 gallon per 75 adult chickens. The solution applied to the birds is effective for mites only. Pay particular attention to the vent area when spraying to insure complete spray penetration and coverage.
.25% Dust -- Apply with shaker can at rate of 1 lb/100 birds. Dust to cover vent area. Recommended for treatment of mites only.