Downy mildew typically appears from late July to August, so it's essential to regularly inspect leaves and shoots for early signs. To manage the disease effectively, apply fungicides before the initial infection occurs. During August, when the disease is most active, spray 1–2 times using either 40% Aluminum Phosphite at a dilution of 300–400 times or 25% Fosetyl-Al at 500–600 times. If you're also dealing with root rot or other fungal diseases, consider mixing in Rhizoctonia or Zeslenium, which can help treat fruit-related infections. For diseases like white rot, fruit drop, and leaf blight, it's important to promptly remove and burn infected plant material to prevent further spread.
For pest control, target grape leafhoppers by spraying 40% Dimethoate at a 1000-times dilution. In July and August, warm and humid conditions favor the development of red spider mites, so applying 40% Acephate at a 2000-times dilution can be effective. Always follow safety guidelines when handling pesticides and ensure proper coverage on both sides of the leaves. Regular monitoring and timely intervention are key to maintaining healthy grapevines throughout the growing season.
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