1. Symptoms: The leaves, petioles and stems can all be affected. The lesions begin with pale yellow dots and form white patches on the leaf surface. They gradually spread. Many white patches are connected to cover the entire leaf. , death, the plant premature aging.
2. Control methods: enhance ventilation and light transmission, increase plant growth potential, and increase disease resistance. At the beginning of the disease, 45% of chlorothalonil smoke can be used to kill pathogens. Each time, 200-250 grams of medicine is used per mu of greenhouse, and 15% triadimefon WP can also be sprayed on the leaves for 1500 times.
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