Laboratory Evaluation of Certain Chemosterilants Against the Gypsy Moth

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Abstract
The chemosterilants metepa, tepa, and apholate were tested against the eggs, pupae, and adults of the gypsy moth, Porthetria dispar (L.). No reduction of hatch was observed in the chemosterilant-treated eggs. Pupal dips were ineffective except with tepa, which caused high pupal mortality. At the concentrations used (1, 4, and 8 μg per moth), topical applications to both sexes were ineffective. Residual films of tepa and metepa caused significant sterilization of male moths at 1 and 10 mg/½ pint bottle levels respectively. Apholate showed sterilizing action only at high residual levels with both sexes treated.

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