Downy mildew typically occurs from late July to August, so regular monitoring of leaves and shoots is essential. It's important to apply preventive sprays before the first signs of infection. During August, when the disease is most active, it's recommended to spray 1 to 2 times using either 40% aluminum phosphite at a dilution of 300 to 400 times or 25% fungicide at 500 to 600 times. If Rhizoctonia or other bacterial agents are present, they can be treated as fruit diseases. For conditions like white rot, fruit drop, downy mildew, and leaf fall, infected parts should be promptly removed and burned to prevent further spread.
For insect control, grape leafhopper nymphs can be managed by spraying 40% dimethoate diluted 1000 times. In July and August, when temperatures and humidity are ideal for red spider proliferation, it's advisable to use 40% phosalone at a dilution of 2000 times. Regular inspections and timely treatments are crucial to maintaining healthy grape plants and minimizing crop losses. Always follow the manufacturer’s instructions for safe and effective application.
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