Space sprays or aerosols can be effective for rapid knockdown and kill of adult flies present during the application. Daily use of mist blowers or foggers may be necessary when used as the sole treatment. However, this will then quickly lead to resistance. For best control results, reduce air movement as much as possible by closing doors and windows. Animals may be present (only if product is so labeled) during application, but not directly treated. If animals were treated directly with a pesticide 24 hours earlier, do not treat. Avoid contamination of feed, water, milk, and milk utensils or use in milkrooms (except certain pyrethrins and permethrin labeled products).
(a) Mix one quart of naled (Dibrom) 36 percent EC in 40 gallons of water. Apply throughout the building. Mix five pints Dibrom 58 percent EC in 200 gallons of water. Apply five gallons prepared spray per acre of premise.
Apply one fluid ounce of naled (Dibrom) one percent ready-to-use formulation per 3,000 cubic feet of area. Spray around and above animals, but not directly at them.
(b) Mix one quart permethrin (Ectiban, Hard Hitter) 5.7 percent EC in 12.5 gallons of fuel or mineral oil "overhead system" or undiluted "misting" at the rate of four fluid ounces per 1,000 cubic feet.
Mix four fluid ounces permethrin (GardStar) 40 percent EC to 10 gallons mineral oil for "overhead system." Apply four fluid ounces of spray per 1,000 cubic feet of air (do not use in milkroom). Mix one half fluid ounces to one gallon of water. Apply as a fog or fine mist using two fluid ounces per 1,000 cubic feet of air (can be used in milkroom).
Mix one quart permethrin (Permectrin II) 10 percent EC in 12.5 gallons of fuel or mineral oil "overhead system" or undiluted "misting" at the rate of four fluid ounces per 1,000 cubic feet.
(c) Apply one to two fluid ounces of pyrethrins and synergist 0.1 percent to 0.2 percent ready-to-use formulation per 1,000 square feet of area. Apply as a fog at the rate of five to six seconds per 1,000 cubic feet when adult flies are present. Keep room closed 15 minutes following application.
To reduce possible fly resistance, alternate applications of pyrethroids (permethrin) and organophosphates (naled) throughout the season.