The Relation Between Uptake and Toxicity of Organophosphates for Eggs of the Large Milkweed Bug

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Eggs of the large milkweed bug, Oncopeltus fasciatus (Dallas), arc totally insensitive to parathion vapor, but freshly emerged larvae are sensitive. Work with H3- parathion showed that large quantities are taken up by the eggs, but very little reaches the embryo. However, on emergence from poisoned eggs, larvae rapidly take up parathion from the egg and die soon thereafter. Ten other organophosphates and 2 carbamates are, like parathion, without ovicidal action on this species; but dichlorvos and trichlorfon are lethal to the late stages of developing eggs. Studies with C14-dichlorvos showed that extremely large quantities are taken up by the eggs, and a large fraction of it reaches the embryo. It is concluded that the nontoxicity of parathion is a penetration phenomenon, involving either a barrier or very poor partitioning from external lipid into the egg interior; but the ineffectiveness of dichlorvos to early stages may be due to their intrinsic insensitivity.

Document Type: Research Article

Publication date: August 1, 1965

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  • Journal of Economic Entomology is published bimonthly in February, April, June, August, October, and December. The journal publishes articles on the economic significance of insects and is divided into the following sections: apiculture & social insects; arthropods in relation to plant disease; forum; insecticide resistance and resistance management; ecotoxicology; biological and microbial control; ecology and behavior; sampling and biostatistics; household and structural insects; medical entomology; molecular entomology; veterinary entomology; forest entomology; horticultural entomology; field and forage crops, and small grains; stored-product; commodity treatment and quarantine entomology; and plant resistance. In addition to research papers, Journal of Economic Entomology publishes Letters to the Editor, interpretive articles in a Forum section, Short Communications, Rapid Communications, and Book Reviews.
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