Fly control-Fly larvae

Management-biological control

Wasp parasites (Spalding, Kunafin), when properly applied, can greatly reduce fly populations on dairies, in feedlots and at other confined livestock operations, equine facilities, and poultry farms. The tiny adult female wasp inserts an egg into a fly pupa, killing the fly. The egg hatches into a larva that feeds inside the pupal case and develops into an adult that emerges from the case to seek other hosts to parasitize. Application instructions vary with type of operation and number of animals. For optimum effectiveness, multiple releases are required throughout the fly season. Parasite releases are generally not compatible with insecticide use.

Management-chemical control

  • azadirachtin (Ecozin Plus 1.2%) at 1.25 oz per 1,000 sq ft diluted in 20 to 40 gal water. Direct a coarse spray on fly and beetle breeding sites. Apply weekly during fly-breeding season. Add a spray oil or surfactant to enhance penetration into manure and refuse piles. Some formulations are OMRI-listed for organic use.
  • cyromazine (Larvadex)-Poultry only. See label for rates and restrictions. Feed for 4 to 6 weeks and then monitor manure for fly activity. Continue treatment if larvae appear. Sanitation and adult fly control are essential for satisfactory results.
  • cyromazine (Neporex 2SG)-Scatter 1 lb/200 sq ft or spray 1 lb/gal per 200 sq ft. Spray floor of calf hutches 3 days after manure removal, repeat treatment after each manure removal or when fly larvae are found. In poultry houses, spray entire manure area 1 week after manure removal, repeat treatment after each manure removal or when fly larvae are found.
  • ddvp (Vapona 40.2%)-Spray at 1 gal/100 gal water. Apply as a mist spray or as a coarse, wet spray. Do not contaminate water, feed, milk or milking utensils. Use a 0.5% spray solution by mixing 1 pint of this product with 12 gal water. Apply to building surfaces as a coarse, wet spray at the rate of 1 quart per 1,000 sq ft. Do not contaminate water, feed, milk or milking utensils.