Abstract
Eleven insect growth regulators of the aryl terpenoid ether type had LC-90 values ≤0.020 ppm in laboratory tests against larvae of Anopheles quadrimaculatus Say; 13 others had LC-90 values <0.100 ppm. In further tests against larvae of An. albimanus Wiedemann and Aedes taeniorhynchus (Wiedemann), 6 aryl ethers containing the 3,4-methylenedioxy group had LC-90 values ≤0.020 ppm in 11 of the 12 tests. 5-[[6-(3,3-Dimethyloxiranyl)-4-methyl-3-hexenyl]oxy]-1,3-benzodioxole showed outstanding activity against all 3 species: LC-90 values ranged from 0.011 to 0.0007 ppm. 3-[6-(3-Ethylphenoxy)-3-methyl-3-hexenyl]-2,2-dimethyloxirane was ineffective against Ae. taeniorhynchus, but it had LC-90 values of 0.001 and 0.0003 against An. quadrimaculatus and An. albimanus, respectively, and was the most active chemical against the 2 anopheline species. In small-plot field tests against An. quadrimaculatus, 5-[[7-(3,3-dimethyloxiranyl)-5-methyl-3-heptenyl]oxy]-1,3-benzodioxole, 3-[6-(3-ethylphenoxy)-3-methyl-3-hexenyl]-2,2-dimethyloxirane, and 2,2-dimethyl-3-[3-methyl-6-(4-propylphenoxy)-3-hexenyl]oxirane were the 3 most effective chemicals and gave 100% control of eclosion at a rate of 56 g/ha and ≥90% control at a rate of 11 g/ha; 5 others gave 100% control at a rate of 112 g/ha.
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