Downy mildew is an important disease on the grapes, which mainly damages the leaves, causing a large number of fallen leaves, and it also infects young tissues such as tendrils, spikes and young fruits. In recent years, due to the long-term continuous use of thiophanate-methyl drugs such as thiophanate-methyl control, the bacteria have produced high resistance to these drugs, and the control effect is poor. In 2010, Yang Yiling and others from Guilin Institute of Agricultural Sciences in Guangxi Province experimented with silver lyophils 68.75% fluorophyrin propriocarb suspension, saifan 64% MN wettable powder and mycotoxin 72% acryloyl-zinc wettable powder Other drugs to prevent grape downy mildew, and achieved better control effect.
The test consists of 5 agents: 68.55% of silver-farina, 1500-fold suspension of propriocarbamate, 64% of freeze-drying Mn-Zn wettable powder, and 72% of enzymatic zinc enzymatic zinc. Powder 800 times liquid, Ruiduxue 25% metalaxyl WP 800 times and 70% thiophanate-methyl wettable powder 1000 times, with clear water as the control. Each application was made on June 12 and June 22.
The results of the trial showed that 68.55% of Fenoxycarb feroxifolid suspension concentrate, Saifen 64% frosted MnZn wettable powder and Mycotoxin zinc wettable powderyzefloxacin 72% had good control effect on grape downy mildew. After 3 days, the efficacy of the drug is about 80%, and the duration of efficacy is long. After 10 days and 20 days, the efficacy of the drug is above 80%. The control agent Ruidumil 25% metalaxyl wettable powder has the best quick-acting effect. The control efficacy is 82.15% after 3 days, but the effective period is short, and the control effect is reduced to 70.85% after 20 days; 70% methyl The control efficacy of thiobisulfan WP was 75.67% after 3 days, and the efficacy was reduced to 52.37% after 20 days.
The above three kinds of agents are systemic fungicides with protection and treatment functions. They are produced before the onset of disease or at the early stage of the disease. They use 65% silver fluoroaliopyrrolidone suspension 1500 times, or Saifen 64%. Cream Mn-Zn wettable powder 800 times, or mildew enemy 72% acryloyl zinc WP 800 times spray, pay attention to alternate medication, 7 to 10 days before spraying.
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