Phytotoxicity of Demethylated Analogs of Diphenamid

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Abstract
The phytotoxicity ofN,N-dimethyl-2,2-diphenylacetamide [diphenamid],N-methyl-2,2-diphenylacetamide, 2,2-diphenylacetamide, and 2,2-diphenylacetic acid was studied on tomatoes [Lycopersicon esculentumMill.], common lambsquarters [Chenopodium albumL.], redroot pigweed [Amaranthus retroflexusL.], and rape [Brassica napusL.], by means of nutrient solution culture techniques. Diphenamid was the most phytotoxic; 2,2-diphenylacetic acid was the least active. Only minor differences in the arithmetical means of the phytotoxicity indices existed in the phytotoxicity of theN-methyl and amide analogs of diphenamid.