Single azoxystrobin applications were effective in minimizing yield loss due to sheath blight in all cultivars. Fungicide treatments reduced sheath blight incidence and severity, regardless of cultivar except in Jupiter. Milling yields were affected to a lesser extent. Inoculation significantly increased sheath blight severity and incidence and caused yield losses of 8% in moderately resistant cv. Azoxystrobin at 0.17 kg a.i. ha −1 was applied at mid-boot. Sheath blight epidemics in field plots were initiated by inoculation at the panicle differentiation growth stage in 20. A study was conducted to determine the response of cultivars, with different levels of susceptibility, to sheath blight inoculations and fungicide application and to determine the impact of sheath blight disease development on rice yield and quality. ![]() Among cultivars currently in cultivation in the southern United States, sheath blight resistance levels range from very susceptible to moderately resistant. The increased number of sheath blight ( Rhizoctonia solani)-resistant rice ( Oryza sativa ) cultivars available will allow producers to use less fungicide and avoid significant reductions in grain and milling yields.
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