Control method of cucumber bacterial leaf spot in open field

Summer is the high incidence period of cucumber bacterial angular spot disease. The disease mainly invades cucumber leaves, melon strips, vine stems and other parts. Because the damage symptoms on the leaves are similar to the symptoms of cucumber downy mildew, so to choose Prevention and control measures bring certain difficulties and often cause greater economic losses. Therefore, vegetable farmers should take measures to prevent and treat them as soon as possible. First, humidity and disease prevention The disease easily occurs when the temperature is 18 to 26°C and the relative humidity is lower than 70%. Cucumber in open field can take measures to reduce the humidity in the field and avoid or delay the occurrence of disease when the temperature has met the disease conditions. For poorly ventilated plots, the planting density should be appropriately reduced. Before entering the rainy season, low-lying land should be prepared for flood prevention and drainage. To moderate pruning and improve ventilation conditions in the field. According to the weather, drought conditions in the field and plant growth, proper amount of water should be applied. After the thunderstorm, apply water to the well to reduce the field temperature. Second, the symptoms of the disease identified in the disease when the primary leaf was oily greenish small spots, and then expanded into a polygonal yellow-brown lesions, then turned into gray, easy to perforation rupture, humidity, leaf lesions at the back White bacterial pus; Guaishi infected, the primary water-immersed dark green small lesions, lesions can be connected after the expansion, the lesions were gray later, when the humidity is large, the site of disease with white bacteria pus; stem vine disease Spots are similar to lesions on melon strips. Cucumber downy mildew also occurs in the foliage of yellow-brown lesions, if the two diseases are not easy to distinguish, you can pick 1 ~ 2 diseased leaves, wash with water, put it in a clean plastic bag, sealed and put After 24 to 48 hours at a suitable temperature, look at the spot on the back of the leaf. If there is a white pyoderma, it is a bacterial keratoderma. If a layer of black mold appears, it is a downy mildew; sometimes, it is found on the diseased leaf. Polygonal yellow-brown lesions have white bacteria and pus, and some of the polygonal yellow-brown lesions have black mold layer, which means that the field of bacterial leaf spot and downy mildew simultaneously. Third, to avoid transmission of the disease pathogens are bacteria, and more invasion of plants from the wound or water hole. Therefore, when managing the field, it should be noted that pruning, tying, and other agricultural operations, if it is sunny, can be performed after the dew has dried in the morning to promote the healing of the wound as soon as possible. After suffering hail, all fields should be sprayed in time. The newly discovered diseased leaves and diseased fruits should be removed in time and placed in bags (including various debris generated during pruning), brought out of the field and buried or burned, and should not be thrown away in the fields. Fourth, the timely initiation of spraying, the whole plant can spray (leaf also sprayed on the back). In the case of bacterial keratoses alone, 50% of copper citrate can be used as a wettable powder 500 times solution, or 14% of ammonia solution as 300 times, or 77% can be used to kill 400 times of wettable microparticles. Or neomycin-containing 200 mg/kg liquid, or 72% agricultural streptomycin soluble powder spray 4000 times. When bacterial leaf spot and downy mildew occur at the same time, use 47% Garnett WP 600 to 800 times, or 60% EDP WP 500 times, or 50% methicone wettable powder 600 times liquid spray. To be used for rotation, pay attention to the safety interval of pesticides used. In addition, after the cucumber is pulled, it is necessary to promptly clear the field sickness, and all of it is transported to the field and buried or burned.

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