From your own link:
50% WP -- Dilute 7 oz/5 gal for .5% solution.
80% WP -- Dilute 4 oz/5 gal for .5% solution.
43% EC Spray -- Dilute 7 oz/5 gal for .5% solution.
Apply to birds with a pressurized or power sprayer at the rate of 1 gallon per 75 adult hens. Carbaryl is a restricted chemical. Users must obtain a permit from the Agricultural Commissioner.
Spray the vent and fluff areas from beneath the bird. Provide mechanical agitation or stir mixture frequently. For litter operations, an evenly sprayed application can be made to the litter surface. Avoid contamination of feed and water. Treatment of infested birds only may be preferable to treating all birds in a flock. Northern Fowl Mites are tolerant to carbaryl in some poultry production areas.
Do not repeat treatment more often than every four weeks. Do not apply within seven days of slaughter.
5% Dust -- Apply with shaker can at rate of 1 lb/100 birds or dust bath box at rate of 5 lb/100 birds.
10% Dust -- Apply with shaker can at rate of .5 lb/100 birds or dust bath box at rate of 2.5 lb/100 birds. When using a dust box, the size should be 24"x36"x4".