Downy mildew is one of the main diseases caused by fungal infection on vegetables. Cucumber, Chinese cabbage, spinach, radish and other vegetables are susceptible to this disease. If not treated in time, it will cause serious damage to vegetable production. Hazard characteristics: The leaves of the damaged plants initially showed irregular pale green yellow spots, and white molds appeared on the back of the leaves. As the disease progressed, the lesions gradually expanded, and the yellow to yellow brown spots were polygonal due to the limitation of the veins. Several lesions often join together to form a yellow plaque, which eventually leads to partial or mostly dryness of the leaves. Vegetable downy mildew prevention and treatment methods: Agricultural control First, heavy disease fields must be implemented in 2-3 years. Apply the fermented organic fertilizer to improve the disease resistance of the plant. The second is rational close planting, scientific watering, to prevent flooding of large water, in order to prevent disease from spreading with water. Strengthen the release of wind and reduce humidity. Third, if a diseased plant infected by downy mildew is found, it should be removed in time, brought out of the field for burning or deep burial. At the same time, the lime is treated to fix the planting point to prevent the spread of the disease. At the time of harvest, the fallen leaves are completely removed and taken to the field for deep burial or burning. 2. Chemical control It can be sprayed with 75% chlorothalonil WP 500 times in the early stage of the disease. When the disease is serious, use 58% nail cream, manganese zinc wettable powder 500 times liquid or 69% enoyl manganese zinc wettable powder 800 times liquid. spray. Spray once every 7 days, continuous control 2 to 3 times, can effectively control the spread of downy mildew. At the same time, it can be combined with spraying foliar fertilizer and plant growth regulator for better control. OSHA/ANSI,safety hat,construction hat,work hat Ningbo Staneex Imp. & Exp. Co., Ltd. , https://www.staneex.com
Summer vegetable downy mildew