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This disease is easy to occur in the case of poor ventilation in high temperature weather. This can also occur if the application of excessive nitrogen fertilizer or insufficient fertilizer occurs. When the plant grows too vigorously or grows poorly, the disease is severe. It can occur from the seedling stage to the harvest stage, and it is the most common in the middle and late growth stages, mainly affecting the leaves. In severe cases, the stems and petiole can also be damaged. The disease starts from the middle and lower leaves of the plant and spreads rapidly. In the early stage of the disease, the leaves are positive. Or a white near-round powder spot on the back, gradually expanding into a large white spot. When the disease is serious, many lesions are connected to the whole leaf, causing the leaves to be yellow, curled, and brittle, and the fruit stops growing, eventually leading to the whole plant. Premature aging and death.
Second, the control measures are planted with varieties that are resistant to disease.
Different varieties have different resistance to powdery mildew. Generally, early-maturing varieties are weakly resistant, and mid-late maturity varieties are more resistant.
Carry out crop rotation, do not mix with cucurbitaceae vegetables, it is best to implement water and drought rotation, reduce pathogens, should choose high-land, loose soil, well-drained plots.
Seed treatment.
Before sowing, soak the seeds with warm water of about 55 °C, continue to soak for 12 hours after natural cooling, seed dressing with new high-fat film before sowing, repel the underground pests, strengthen the breathing intensity, and increase the germination rate of the seeds.
Strengthen cultivation and management of fertilizer and water, arrange planting density reasonably, and avoid excessive density. Appropriate application of nitrogen fertilizer to avoid excess. Drainage in time after rainfall to avoid accumulation of water to reduce the humidity in the field to reduce the occurrence of powdery mildew. In the pre-flowering, young fruit stage, and fruit expansion period, the squash is used to make the cucurbits thicker, strengthen the nutrient transport, enhance the plant's resistance to stress, promote the rapid development of the melon body, make the melon shape beautiful, and the juice is delicious. In the middle and late growth stages, the old leaves and diseased leaves should be cut off in time, and the plants should be cleared in time to reduce the pathogens.
Chemical control. When a central diseased strain was found, 12.5% ​​of myclobutanil EC was used 2000 times or 78% of Cobo's wettable powder was 600 times. If the condition is very serious, apply a mixture of fungicide and leaf fertilizer. The disease spreads quickly and should be prevented as soon as possible.