House Crickets: Ovicidal Effect of Fenthion on Mortality and Cholinesterase Activity1

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Abstract
Tests were undertaken to determine factors associated with mortality of eggs of Acheta domesticus (L.) dosed topically with fenthion in dimethyl sulfoxide (DMSO). Factors tested were: interference with fluid uptake by DMSO, degree and timing of cholinesterase (ChE) activity inhibition, time of dosage, and penetration of pesticide through chorion. Death of eggs dosed 0, 1, or 2 days after oviposition was immediate, and due to effects of DMSO, When eggs were dosed 3 or more days after oviposition, death was delayed until just prior to hatching, and was correlated to low levels of ChE activity at that time. Mortality was highest with eggs dosed 3, 7, or 8 days after oviposition. Hypotheses are offered to explain high mortalities at those times.

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