25^ 



is all a poultryman can expect to get from compounds that are presently 

 available (J. F. Butler, personal communication). 



The lowest level of CGA 72662 (0.05%) began to break down in \k 

 days, but the other levels of CGA 72662 were still active 35 days post- 

 treatment. CGA 72662 {0.]%) remained active for 35 days even when 

 tilled into wet manure. Potential resistance problems would result if 

 CGA 72662 concentrations were not periodically increased to ensure the 

 production of 100% larval mortalities. 



In a liquid form, CGA 72662 may not be as convenient to use as 

 methoprene granules. However, when used for spot treatment of house 

 flies in manure, the residual of CGA 72662 would prevent fly activity 

 for long periods and allow treated areas to dry out. Retreatment would 

 not be as frequent as with methoprene. CGA 72662, like dimilin, kills 

 fly larvae in all stages and prevents rapid fly resurgence. Ciba-Geigy 

 has done residua! testing but the results are unknown at this time. 



The Efficacy of CGA 72662 in Water 



CGA 72662 added to drinking water of hens at rates of 1.5 to 20.0 

 ppm produced larval mortality rates in the laboratory house fly strain 

 of 8O.89 to 100.00% respectively, and was still effective 3 days post- 

 treatment. Ciba-Geigy representatives claim that fly control ceases the 

 day that use of treated water ceases (D. B. Hays, personal communication) 



Although the use of a larvicide in drinking water may be considered 

 impractical by members of the poultry industry (R. H. Harms, personal 

 communication), Ciba-Geigy feels that all routes of application should 

 be open to the poultryman (D. B. Hays, personal communication). 



