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This article in AJ

  1. Vol. 59 No. 3, p. 227-230
    Received: Nov 9, 1966

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Phytotoxic Pesticide Interactions in Soil

  1. R. G. Nash2



Phytotoxic interactions resulting from pesticide combinations in soil and bioassay techniques for determination of such phytotoxic effects were investigated. A combination of dalapon with Di-Syston, phorate, or carbaryl in soil resulted in additive phytotoxic effects. Diuron combined with Di-Syston, phorate, or carbaryl produced synergistic phytotoxic effects. Captan combined with dalapon gave an independent effect, while chloranil was antagonistic toward the herbicidal activity of diuron. Dry rather than fresh weights were a more precise measurement of phytotoxic effects. Identification of phytotoxic interactions was not affected by growth durations of 3 or 5 weeks when oats were the bioassay plant. Combinations of more than two pesticides in soil usually did not result in third order interactions.

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