Abstract
Nymphs of the pea aphid, Acyrthosiphon pisum (Harris), were fed on synthetic liquid diets contaning chemosterilants or growth regulators. Mortality and fecundity were measured for effects of 27 chemosterilants, maleic hydrazide, Cycocel®, (2-chloroethyl) trimethyl-ammonium chloride) and synthetic “queen substance” (9-oxodec- trans -2-enoic acid). At specified dosages, 6 of the chemosterilants caused permanent sterility, 2 caused temporary sterility, and 21 decreased fecundity. Both maleic hydrazide and synthetic “queen substance” caused high mortality to feeding nymphs, and reduced fecundity in surviving adults. Cycocel was not so toxic to feeding nymphs, but adult fecundity was reduced.
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