Bacterial blight is a serious disease that damages spring sowing and summer sowing cucumber. The disease mainly harms stems and leaves. At the onset of stems and bases, round or fusiform yellow-brown, oil-immersed, lesions slightly sunken, and amber gums were produced, with small black spots on the surface. After the onset of the leaves, round or irregular large lesions appeared. The later lesions were easily broken, and black spots on the lesions were dense. Leaf lesions are 10 to 35 cm in diameter with a few lesions larger. The diseased leaves are yellow from the bottom and do not fall off. In severe cases, only the top one or two leaves are left. The blight disease develops from the surface of the stem to the inside. The vascular bundle does not change color and does not cause death in the whole plant. This is an important difference from the wilt disease.
Many bacterial pathogens of spores or ascospores of winter wheat are overwinter in diseased bodies and soils. They are mainly transmitted by irrigation water and airflow, and invade from stomata, water holes or wounds. Seed carriers can cause cotyledon incidence. High temperature and humidity, poor ventilation, partial application of nitrogen fertilizer, flat vine cultivation, flood irrigation, rain and rain, weak plant growth and leggy, land masses that repeatedly ravaged the year are prone to cause morbidity.
Control methods: First, thoroughbred rotation to select disease-free seeds or to select seeds from disease-free plants. Implement rotation for 2 to 3 years or more. Second, strengthen the management and cultivation of strong seedlings, increase phosphorus and potassium fertilizers, enhance plant resistance, strengthen ventilation and light, reduce temperature and humidity, and improve the field microclimate. Third, the early stage of chemical control can use 75% chlorothalonil wettable powder 600 times, or 70% thiophanate WP 800 times, or 50% carbendazim WP 1500 times, or 45% chlorothalonil Clear smoke agent, 250 grams per acre, or 40% Fuxing Star EC 800 times, every 7 to 10 days control once, continuous control 3 to 4 times.
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