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Abstract
Laboratory tests were conducted to determine the phytotoxicity and fungitoxicity of five pyrethroid insecticides; cypermethrin, decamethrin, fenpropanate, fenvalerate and permethrin at different rates to soybean and its pathogen Rhizoctonia solani Kuehn. Fungitoxicities of the chemicals on pathogen were in the order of thiram > permethrin > cypermethrin > decamethrin > fenvalerate. Phytotoxicities on soybean seedlings were decamethrin > cypermethrin > fenpropanate > fenvalerate > permethrin > Arasan. A comparative study on both phytotoxic and fungi‐toxic effects indicated that the pyrethroids were less effective than Arasan for use in the control of this soil borne plant pathogen.