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This article in AJ

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


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doi:10.2134/agronj1967.00021962005900030006x

Phytotoxic Pesticide Interactions in Soil

  1. R. G. Nash2

Abstract

Abstract

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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