Laboratory and Field Evaluations of Chemosterilants for the Gypsy Moth in 1964, 19651

Abstract
Pupal dip tests with tests using gypsy moth, Porthetria dispar (L.), male pupae less than 12 hours old in 0.05% tepa solutions led to high mortality, but survivors were not sterile. Residual film treatments with hempa at 40 mg per gallon bottle led to high moth mortality but inconclusive sterility. Tepa residue film treatments varying from ½ to 12 mg per gallon bottle indicated that either long treatments (24 hours) with low residual film concentrates (1 mg per gallon bottle) or short treatments (4 hours) with high film concentrations (12 mg per gallon bottle) and long posttreatment holding times (24 hours) will lead to a high degree of moth sterility. Practical sterilizing conditions are probably best represented by an 8 mg per gallon bottle film with an 8-hour treatment and no posttreatment holding of the moths, Field competition tests using moths sterilized for 8 hours at the 8 mg per gallon bottle level indicated that the sterilized moths are competitive with untreated normal moths.

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