Evaluation of the IGR Larvadex as a Feed-Through Treatment for the Control of Pestiferous Flies on Poultry Ranches

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Abstract
Larvadex, or CGA-72662 (N-cyclopropyl-1,3,5-triazine-2,4,6-triamine), having insect growth-inhibiting properties, was evaluated for the control of manure-breeding flies on poultry ranches. A 0.3% premix formulation of this compound was incorporated into chicken ration and fed for various periods to egg-laying hens housed in suspended wire cages. When fed for 33 days at the rate of 1.5 ppm in the feed, no reduction of larval populations of Musca Domestica (L.) and Fannia femoralis (Stein) was evident. However, adult emergence of M. domestica was markedly and significantly lowered on day 12 of feeding and remained suppressed during the remaining feeding period and up to 14 days posttreatment. There was no suppression of emergence of adult F. femoralis at this rate. At the rate of 5 ppm in the ration, Larvadex yielded almost complete inhibition of development of larvae of M. domestica for the entire period of feeding, as well as for an additional 14 days post feeding. Adult emergence from pupae resulting from surviving larvae was almost completely inhibited during the feeding period as well as for 21 days post-feeding. Larval populations of F. femoralis were suppressed starting on day 13 of feeding and remained suppressed for up to 15 days after cessation of the treated feed. Adult emergence was also markedly and significantly reduced on day 13 of feeding and continued to remain low for about 15 days after cessation of treated feed. Larval development and adult emergence of Muscina stabulans (Fallén) was almost completely inhibited during feeding and up to 15 days post-feeding.