Insecticides may be applied as residual surface sprays, non-residual space sprays, baits, manure sprays, or feed additives. Always read and follow label instructions before applying insecticides for fly control. Treat walls, ceilings, posts, and other fly resting sites. Spray these areas thoroughly and to the point of runoff. In order to minimize control failures due to insecticide resistance, do not apply the same insecticide, or insecticide within the same chemical class (particularly pyrethroids), repeatedly throughout an entire season. See product labels for use rates. In order to minimize control failures due to insecticide resistance, do not apply the same insecticide or insecticide within he same chemical class repeatedly throughout an entire season. Alternate applications of pyrethroids (permethrin) and organophosphates (stirofos, fenthion).
| Pyrethroid Insecticides | Organophosphate Insecticides |
| cyfluthrin- Countdown 2 E or Countdown 25% WP | fenthion-Baytex 4 45% EC |
| lambda cyhalothrin- Grenade 10% WP | naled - Fly Killer D |
| permethrin- Atroban 11% EC; Ectiban 5.7% EC or 25% WP; Permectrin II 10% EC (and others) |
stirofos-Rabon 50% WP stirofos + vapona- Ravap EC |
| Spinosyn | |
| spinosad - Elector 2.46%L | |
Note: Remove animals from barn before spraying. Allow at least four hours for spray to dry before allowing cows to return to the barn. Application may be made to walls ceilings, partitions, posts, and other fly resting areas. Do not contaminate feed, water or milking equipment and do not apply these materials in the milk room. These same materials may also be applied onto fly resting areas outdoors. Apply one gallon of spray solution per 500 to 1,000 square feet. Residual fly spray materials listed above should control flies for 1-7 weeks.
Baits can be an effective supplement to a fly control program. However, baits alone will not control fly populations. Dry baits can be scattered where house flies congregate to provide some temporary reduction in numbers. Never use baits where cattle or other animals can eat them. Place baits in areas where flies congregate, such as window sills or doorways. They should be used along with sanitation and other insecticidal methods (e.g., residual and space sprays). Read the label for further instructions.
Fly Baits
| Active Ingredient | Insecticide | Chemical Class |
|---|---|---|
| imidacloprid | Quick Bayt | neonicotinyl |
| methomyl | Apache, Fatal Attraction, Golden Malrin Fly Bait Plus, Tailspin | carbamate |
| trichlorfon | Dipterex | organophosphate |
Contact Sprays, Fogs or Space Sprays
| Insecticide | Rate |
| Pyrethrins + Piperonyl butoxide OR Pyrethrins + Piperonyl butoxide +MGK 326 Repellent |
Ready-to-Use 1 to 2 fl oz.1,000 ft3 |
| Ectiban 5.7% EC or Permectrin II 10% EC | Ready-to-Use 1 to 2 fl oz.1,000 ft3 |
| Vapona 23.4% EC (dichlorvos) Vapona 1% OS | 1 qt/6 gal water Ready-to-use |
Pyrethrins + Piperonyl butoxide: Apply as fog for 1-2 oz. or 1-2 seconds/1000 cu ft when adult flies are present. Keep room closed 15 minutes following application. Use as necessary. Ectiban and Permectrin: Apply with a mist sprayer onto 1,000 sq ft of surface.