Abstract
In an attempt to account for their widely differing susceptibilities to parathion, the uptake and metabolism of P32-parathion vapor by eggs of the large milkweed bug ( Oncopeltus fasciatus (Dall.)) and peach tree borer ( Sanninoidea exitiosa (Say)) and the uptake by eggs of the Mexican bean beetle ( Epilachna varivestis Muls.) and southern arnyworm ( Prodenia eridania (Cram.)) were investigated. In all cases large amounts of parathion Were taken up by the chorion and most (50% to 94%) Could be washed off with acetone followed by chloroform. considerable variations were found in ability of the eggs to take up parathion and in penetration of the chorion by the parathion. In the ovicidally susceptible peach tree borer and the nonsusceptible milkweed bug conversion of internal parathion to paraoxon was 30% and 25%, respectively, suggesting that activation and detoxification did not account for the insensitivity of the milkweed bug. In the other three species there was within broad limits a general relationship between internal levels of parathion and ovicidal susceptibility. No single factor could he cited to account for the variations in ovicidal susceptibility of the various species to parathion.
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