First, the symptoms are mainly damaged by the leaves. In the early stage of disease, white mold spots appear on the back of the leaves, and the lesions grow to irregular shapes. Mildew can be mixed with each other for a long time, covered with the back of the leaves, late browning to dark green. The front of the damaged leaves appeared oval or irregular yellowish chlorotic spots. With the expansion of the mold, the yellow areas of the leaves expanded until the whole leaves were yellow. In severe cases, mildew develops on the front surface of the leaves, accelerating the dryness of the leaves and the whole plant. Onset of the disease, a round black disease class was formed near the fruit pedicel. The hardening was slightly depressed and it was not edible. Second, prevention and control technology 1. Agricultural control: In severely warded areas, timely removal of the lower diseased leaves and old leaves of the plants, light wards pruning in time to facilitate ventilation. 2. Ecological control: Strengthen the greenhouse room temperature humidity control, timely ventilation, proper control of watering, timely watering after watering, when the sunny light is sufficient, the greenhouse indoors timely temperature increase to 30 °C -36 °C, significantly inhibit the bacteria . 3. Chemical control: In the early stage of disease, 70% thiophanate-methyl 800-fold solution, 72% ciprofloxacin 800-fold solution, or 58/% metalaxyl MnZn WP 500x, or 75% Bacterial WP wettable powder 600-800 times, or 50% carbendazim WP 800-1000 times, once every 7-10 days, even 2-3 times. After rainy days or watering, 10% chlorothalonil aerosol 300-350g can be selected. In the evening, the shed is fumigated and used once every 10 days; or 5% chlorothalonil dust is 1kg per mu, every 10-15 One more day to prevent.
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