Cucumber bacterial angular leaf spot prevention

Bacterial angular leaf spot is one of the main diseases on cucumber, and it has gradually increased in recent years. Summer is the high season for bacterial leaf spot of cucumber, and measures should be taken early to prevent it. Linyi Fertilizer Network Copyright

Linyi Fertilizer Network Copyright

Cucumber can occur from the seedling stage to the adult stage, mainly affecting the leaves, occasionally on melons and vines. When the leaves are infected, the chlorotic dots appear first, and then the lesions are enlarged by the veins, which are grayish-white or yellow-brown polygons. When the humidity is high, there is a clear water-stained green halo around the leaf spot on the back of the leaf. The milky white water-like pus is found on the lesion, and there is a membranous white mark after the dry. Late lesions are perforated. When the disease is severe, the lesions are connected to each other and are light brown oily paper-like plaques. Stem vine disease, initially water-stained small points, the longitudinal extension is short strips, when there is humidity, there is a pus, and when the condition is serious, the vines are longitudinally cracked. In the early stage of melon infection, water-stained dark green near-circular depressions are formed, which then expand into irregular pale brown large lesions, and the stained white bacteria pus overflows. When the condition is serious, there is a crack or odor rot. The vascular bundles and melons of the diseased plants turn brown. Linyi Fertilizer Network Copyright

Linyi Fertilizer Network Copyright

First, agricultural control: (1) selection of disease-resistant varieties. Jinchun No.1, Jinzao No.3, Jinyou No.30, Jinyan No.2, Jinyan No.6, Zhongnong No.5, Zhongnong No.13, Black Fringe, Longzao No.5 and other varieties have strong disease resistance and can adapt to local conditions. Use. (2) Seed disinfection. Soak for 15 minutes with warm water at 55 °C before sowing, remove and cool in cold water; or soak for 40 minutes with 150% formalin in 150 times, rinse with water and germination. (3) Rotation. Breeding with disease-free soil, and non-melon crops for more than 2 years. (4) Strengthen field management. The deep ditch is cultivated in a narrow ditch, and the three ditch is matched to enhance the ability of preventing rain and drainage in the rainy season. Apply sufficient base fertilizer, increase phosphorus and potassium fertilizer, prevent excessive application of nitrogen fertilizer, and enhance plant disease resistance. The open field cucumber is promoted to shelter from rain, and the cucumber in the protected area is less watered, diversified, and more ventilated before the greenhouse, reducing the humidity in the shed and reducing condensation and dripping. Linyi Fertilizer Network Copyright

Linyi Fertilizer Network Copyright

Second, the chemical control: prevention and treatment of cucumber bacterial angular leaf spot, in the early stage of the disease with 50% succinic acid copper WP 500 times solution, or 60% succinyl phosphine aluminum WP 500 times, or 14% Ammonia copper water 300 times solution, or 47% ruinong wettable powder 700 times solution, or 77% can kill 101 wettable microparticle powder 500 times solution, or 50% nail cream · copper wettable powder 600-700 times Liquid, or 60% bactericidal wettable powder 500 times solution, or 72% agricultural streptomycin soluble powder 4000 times solution spray. Spray once every 7-10 days, depending on the condition, the number of times of application. The application rate of the copper preparation should not exceed 3 times to avoid causing phytotoxicity. Linyi Fertilizer Network Copyright

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