Effect of the herbicides EPTC and linuron on cotton diseases caused by Rhizoctonia solani and Fusarium oxysporum f. sp. vasinfectum



The herbicides EPTC and linuron applied to soil in the field at three different concentrations X2X, 1X, and 2X of recommended dose) decreased post-emergence, but not pre-emergence daraping-off in cotton incited by Rhizoctonia solani. Both herbicides at the two high concentrations significantly reduced wilt incited by Fusarium oxysporum f. sp. vasinfectum. Both herbicides reduced germination of chlamydospores of Fusarium in natural soil, but not in steamed soil. The 2X concentration of EPTC and linuron reduced the saprophytic activity of R. solani in soil. The effects of EPTC and linuron on post-emergence damping-off and wilt were attributed Ic their ability to suppress the saprophytic ability of R. solani and chlamydospore germinability ofFusarium in soil, respectively.