Insect Developmental Inhibitors. 2. Effects on Target Mosquito Species1

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Abstract
A slow-release formulation of ZR-515 (isopropyl 11-methoxy-3,7,11-trimethyl-2,4-dodecadienoate) was practical for controlling field populations of OP-resistant strains of Aedes nigromaculis (Ludlow); successful results on pastures were obtained with aircraft applications using doses as low as 0.025 pound AI per acre. Aircraft applications of 0.1 and 0.05 pound AI per acre of the same formulation also gave encouraging results against populations of Aedes melanimon Dyar larvae on duck-club ponds. Results on populations of Culex tarsalis Coquillett were not considered operationally feasible, and further research is needed. Laboratory and field evaluations of Ro20-3600 (6,7-epoxy-3-methyl-7-ethyl-1-[3-4-(methylenedioxy) phenoxy]-2-cis-trans-octene) and R20458 (trans-8-(4-ethylphenoxy)-2,6-dimethyl-2-3-epoxy-6-octene) showed lesser promise against A. nigromaculis .

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