Autumn is the most serious period of the occurrence of powdery mildew. After the leaves are covered with a layer of white powdery mildew, the leaves are chlorotic and green, and the young fruit shrinks and falls off. The tree vigor is seriously degraded, and the fruit cannot expand and cannot be matured. , Low sugar content, light fruit flavor, poor color, yield and quality are significantly reduced. Therefore, in the autumn, we must pay close attention to the prevention and cure of the powdery mildew of the jujube in order to protect the leaves, promote fruit setting, increase fruit setting rate, promote fruit enlargement and coloring, increase yield, and improve quality.
Specific prevention and control methods: In the autumn, attention should be paid to the inspection of the leaves of the green jujube and the appearance of a layer of white powder on the leaves. When the leaf color is chlorotinous, it is necessary to spray 800 times 50% aqueous solution of triadimefon WP, or 400 times 20% sulfur suspension aqueous solution, 8000 times 40% fluorosiliconazole aqueous solution, 4000 times 30% difenoconazole aqueous solution, 1500 times 80% myclobutanil wettable powder aqueous solution, etc., every 10~ Spray once a day for 15 days and spray 2 or 3 times continuously. If we can add 1500 times 0.001% natural brassin, 0.3% potassium dihydrogen phosphate and 800 times humic acid active liquid fertilizer with the spray in the liquid, the control effect will be better, which will not only enhance the efficacy but also improve the control effect. The diseased leaves resume normal growth, which in turn promotes tree vigor, promotes fruit development, increases yield, and improves quality.
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