Three drugs can prevent grape downy mildew

Downy mildew is an important disease on grapes, mainly affecting leaves, causing a large number of fallen leaves, and also infusing young tissues such as tendrils, spikes and young fruits. In recent years, due to the long-term continuous use of benzoxazole drugs such as thiophanate-methyl, the bacteria have developed high resistance to these drugs, and the control effect is poor. In 2010, Yang Yiling et al., Guilin Institute of Agricultural Sciences, Guangxi, used silver method to treat 68.75% fluorobacteria and downy mildew suspension, Safran 64% cream·manganese zinc wettable powder and mold enemy 72% enoyl·propenyl zinc. Wet powders and other drugs have been used to control grape downy mildew and have achieved good control effects.
The experiment consisted of 5 chemical treatments, namely, silver method 68.75% fluorobacteria, downy mildew suspension 1500 times solution, Safran 64% cream, manganese zinc wettable powder 800 times solution, mold enemy 72% enoyl propyl group Zinc wettable powder 800 times liquid, dystrophic 25% metalaxyl WP 800 times liquid and 70% thiophanate-methyl WP 1000 times liquid, with clear water as a control. Apply each time on June 12th and June 22nd.
The test results show that Yinfa Li 68.75% fluorobacteria · downy mildew suspension, Safran 64% cream · manganese zinc wettable powder and mold enemy 72% enoyl·propyl zinc wettable powder have good effect on grape downy mildew The control effect is about 80% in the 3 days after the drug, and the effect period is long. The control effect is more than 80% after 10 days and 20 days. The control drug Phytophthora 25% metalaxyl WP has the best quick-acting effect, and the control effect is 82.15% after 3 days, but the effect period is short, and the control effect is reduced to 70.85% after 20 days; 70% methyl The control effect of the thiophanate WP after 3 days was 75.67%, and the control effect after 20 days of the drug fell to 52.37%, and the control effect was poor.
The above three kinds of medicaments are all systemic fungicides, which have protective and therapeutic functions. They are produced before the onset or at the onset of the disease, and are treated with silver method 68.75% fluorobacteria, ruminant suspension 1500 times solution, or Safran 64. % frost·manganese-zinc wettable powder 800 times liquid, or mildew 72% enoyl-propyl zinc wettable powder 800 times liquid spray, pay attention to alternate medication, spray again after 7-10 days.

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