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Joint Actions in Organophosphorus Poisoning in Boll Weevils1,2

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To analye the joint action of bunary mixtures, a lab- oratory culture of organophosphorus-susceptible boll wee- vils . Authonomous grandis Boheman. were exposed to in- secticides, defoliants, and equitoxic insecticide-defoliant mixture. The degree of interaction in a susceptible strain of boll weevils was greater than unity for equiloxic binary mixtures of DEF® (S.S,S-tributyl phosphorotrithioate) with methyl parathion. azinphosmethyl, malathion, and EPN®, (O-ethyl O-p-nitrophenyl phenylphosphonothioate) indicating potentiation of toxicity. It was not possible, however to attribute significance to the numerical degree of interaction since the mechanism of potenliation in these mixtures is unknown, The potentiation of methyl parathion by DEF was not supported by stalistical evidence, indicating that the addition of DEF may not necessarily result in greater-than-additive toxicity.

The potentiating effects of DEF with malathion have previously been attributed largely to inhibition of aliestnase, a type of carboxyesterase, Conversely, EPN, azinphosmethyl, and methyl parathion lack carboxylic ester moieties, and the importance of aliesterase is questionable.

Document Type: Research Article

Publication date: April 1, 1970

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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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