Persistence of Dimethoate and Metabolites Following Foliar Application to Plants

Abstract

Dimethoate [0,0-dimethyl S-(N-methylcarbamoylmethyl) phosphorodithioate] is known to be effective as a systemic insecticide following foliar application. Analyses were made of surface and absorbed residues following foliar treatment of corn, cotton, pea, and potato plants with radioactive dimethoate. The insecticide was rapidly absorbed and decomposed both on the surface and inside the foliage by phosphorothionate oxidation and hydrolysis. Only trace amounts of dimethoate and its oxygen analog were present 32 days after treatment. Of the five identified hydrolysis products, the predominant one from near mature peas was phosphoric acid and from the other plants used as seedlings was 0,0-dimethyl S-carboxymethyl phosphorothiolate on the surface and O-methyl O-Hydrogen S-(N-methylcarbamoylmethyl) phosphorodithioate within the leaf tissue. Limited studies were also made on the persistence of the N-ethyl analog of dimethoate. © 1960, American Chemical Society. All rights reserved.

Source or Periodical Title

Journal of Agricultural and Food Chemistry

ISSN

218561

Page

115-119

Document Type

Article

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