Toxicity of Six Chemical Fungicides against Magnaporthe oryzae and Their Field Control Effectiveness
The toxicity of six fungicides to millet blast was determined by the mycelium growth rate method and conventional spray method.A field disease control test was conducted to screen the fungicides with good con-trol effects on millet blast.The results showed that two fungicides had a better inhibitory effect on Magnaporthe oryzae in the indoor toxicological tests.The EC50 values were less than 0.2 μg/mL,specifically for 450 g/L prochloraz and 0.176 1 μg/mL.The EC50 value of 42%pyraclostrobin·tebuconazole was 0.045 8 μg/mL,and the EC50 value of 40%kasugrel·zinc thiazole was 18.26 μg/mL.In the field efficacy test,the disease in-cidence and disease index for prochloraz were the lowest,with the highest control effect at 79.61%,significantly higher than other treatments.This was followed by pydiflumetofen·difenoconazole and pyraclostrobin·tebucon-azole,with control effects of 69.56%and 63.36%,respectively.The control effect of 40%isoprothiolane was the lowest at only 38.47%.In conclusion,for the prevention and control of rice blast,three agents,including prochloraz,pydiflumetofen·difenoconazole,and pyraclostrobin·tebuconazole,can be used in rotation,demon-strating good efficacy in the prevention and control of rice blast.
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