Herbicides: Combination Enhances Selectivity

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Science  26 Jul 1963:
Vol. 141, Issue 3578, pp. 362
DOI: 10.1126/science.141.3578.362


The herbicides N-(3-chloro-4-methyphenyl)-2-methylpentamamide (solan) and 1, 1'-dimethyl-4, 4'dipyridylium dichloride (paraquat) were less toxic to tomato plants when applied together than either one alone. However, the combination was more toxic to crabgrass and eggplant. This phenomenon may result from the interaction of the herbicides with photosynthesis.