Abstract:

In recent years, due to the resistance of Fusarium graminearum to carbendazim, tebuconazole and prothionazole, the control effect has been reduced. Therefore, the author carried out a field efficacy comparison test on wheat scab with six different chemical treatments and spray times, including 20% pydiflumetofen+25% propiconazol, 40% prothioconazole tebuconazole, 30% trifloxystrobin tebuconazole, 48% difenoconazole azoxystrobin, 43% tebuconazole, to screen green and efficient fungicides for the control of wheat scab, and explore the prospect of reduced dosage, so as to provide guidance for the control of wheat scab. The results showed that 20% pydiflumetofen(900 mL ·hm^-2)+25% propiconazol(600 mL·hm^-2), 40% prothioconazole tebuconazole(900 mL ·hm^-2) could better control the damage of wheat scab, and they were safe for wheat growth. The control effect of diseased ear and disease index after 15 days treatment was 84.6%-85.5% and 86.1%-86.9%respectively treatment the control effect of diseased ear and disease index after 26 days treatment was 81.2%-82.3% and 85.8%-86.4%respectively treatment, which were significantly higher than other treatments, and could be widely applied in production. Accordingly, the spray time under 20% pydiflumetofen+25% propiconazole can be reduced to once, and the purpose of dosage reduction is realized.

Key words: wheat scab, fungicides, control effect, reduced dosage