Screening for Phytotoxic Pesticide Interactions

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Abstract
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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