Azoxystrobin Activity on Rhizoctonia solani and its Efficacy Against Rice Sheath Blight

Abstract

Sundravadana, S., Alice, D., Kuttalam, S., and Sami yappan, R. 2007. Azoxystrobin activity on Rhizoctonia solani and its efficacy against rice sheath blight. Tunis ian Journal of Plant Protection 2: 79-84. Sheath blight, caused by Rhizoctonia solani is one of the major diseases affecting rice crop. We investigated the effect of azoxystrobin on R. solani growth (in vitro) and its efficacy against rice she ath blight, under field conditions. The results reveale d that azoxystrobin at 1, 2, and 4 ppm, completely inhibited mycelial growth of R. solani. Field study showed that foliar spray of azoxystrob in at 125, 250, and 500 g/ha significantly suppressed (> 64%) the d evelopment of sheath blight and enhanced yield leve l (> 60%). For controlling sheath blight disease, the optimum rate of azoxystrobin was 125 g/ha. Our results showed also that there was no residue in ri ce matrices at harvest time and no phytotoxicity at the highest concentration of azoxystrobin (500 g/ha).