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This article in JEQ

  1. Vol. 2 No. 4, p. 493-497
    Received: Dec 26, 1972

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Screening for Phytotoxic Pesticide Interactions1

  1. Ralph G. Nash and
  2. William G. Harris2



Of 165 combinations of pesticides screened on two plant species in the greenhouse, 13 combinations indicated a phytotoxic interaction on at least one plant species. Combinations of the herbicide 3-(3,4-dichlorophenyl)-1,1-dimethylurea (diuron) plus the insecticides O,O-diethyl S-[2-(ethylthio)ethyl] phosphorodithioate (disulfoton) or 1-naphthyl methylcarbamate (carbaryl) in soil were synergistically phytotoxic to oats (Avena sativa L.) and cucumbers (Cucumis sativus L.). A fungicide, p-(dimethylamino) benzenediazo sodium sulfonate, was antagonistic to the herbicidal activity of all s-triazine herbicides tested on cucumbers in greenhouse experiments, but not in the field or to other plant species. The fungicide apparently limited root uptake of the s-triazine herbicides by limiting root growth. No chemical reaction was observed between the fungicide and the s-triazine herbicides.

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