The control of powdery mildew
Powdery mildew mainly harms shoots and young leaves, and occurs mostly in the leaves. The development of old leaf lesions is limited, and the expansion of lesions in young leaves is almost unlimited. In July and August, pathogenic powdery mildew often appeared on lesions, and when severe, the entire lesion became yellow-brown. During the onset of illness, excessive rain, leaves and branches, and over-planting can all aggravate the occurrence of diseases.
Control measures to control planting density, pay attention to ventilation and light, reduce environmental humidity, to strengthen management to enhance tree vigor, combined with plastic pruning in time to remove the diseased, diseased leaves, in order to reduce the source of infection. Spray 50% carbendazim WP 1000 times solution and 20% Triconate wettable powder 1000 times solution before or during the onset of illness; To a very good curative effect; pay attention to the alternate use of agents to prevent germ resistance.
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