The Effects of Various Chemicals on Eggs of the Yellow-Fever Mosquito, Aedes aegypti

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Abstract
Of a series of 28 compounds tested for their ability to exert a fumigant action on mature eggs of Aedes aegypti, 5 were found which killed more than 90% of the exposed eggs at dosages of 1 lambda (0.001 ml) or less per quart exposure chamber in 24 hours. These effective materials and their concentration, in lambda/quart, which gave at least a 90% mortality were: DDVP, 0.03-0.06; Dibron (l,2-dibromo.-2,2-dichloroethyl dimethyl phosphate), 0.25; SD 1836 (diethyl-2-chlorovinyl phosphate),, 0.5; Phosdrin (a mixture of the alpha isomer of 2-carbomethoxy-l-methylvinyl dimethyl phosphate (not less than 60%) and related compounds (not more than 40%) 1.0; and Zinophos (0, 0-diethyl 0-2-pyrazinyl phosphorothioate), 1.0. Simulated field tests using Vapona granules (2% DDVP) killed more than 95% of mature A. aegypti eggs at a dosage of 1.0 lb. actual DDVP per acre. In contrast with the effective organic phosphates, Niagara 5961 (1- chloro-2-nitropropane), acrylonitrile (propenenitrile), acrolein (propenal), and chloropicrin (trichloronitromethane), in addition to a lethal effect, induced a response which caused the embryo to rupture the egg shell in a manner apparently mechanically analogous to normal hatching.

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