The disease is caused by conidial or sclerotia wintering on diseased ear and diseased fruit, and spread when the temperature is above 15. The general onset time is 7 to 10 days before the grape is blooming, so farmers consider the occurrence of gray mold as the standard for calculating the flowering period.
Prevention
1. Comprehensive prevention and control. Controlling nitrogen fertilizers, controlling leggy, and preventing racking and canopy closure are the basic methods for preventing the occurrence of this disease. Carefully and meticulously during the winter and spring and spring gardens, the sickness should be promptly cleaned up. Before the flowers are planted in the shed, cultivating or mulching is performed to reduce the air humidity and soil moisture, and 5 degrees lime sulfur is used before germination. Young fruit timely bagging.
2. Drug control. 7 to 10 days before flowering and fruit drop and fruit drop are the best time to use medicine. Can be used 50% quick-king 2000 times or 50% acetaminophen 1500 ~ 2500 times or 50% of Nongli Ling 500 ~ 600 times have a good preventive effect.
In the shed grape, carbendazim and chlorfluazuron can also be used as preventive and control agents, and Bordeaux mixture also has certain preventive and therapeutic effects. The medication should be thoughtful and detailed, the machine dosage should be about 250 kilograms per mu, and the manual manual sprayer should use about 150 kilograms of water. Insufficient amount of medicine was used and the control effect was poor.
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