First, the symptoms. Cucumber bacterial angular spot disease mainly damages leaves, petioles, tendrils and fruits, and sometimes infects stems. From the seedling stage to the adult stage can be affected. The cotyledons were infected, and they showed a brownish-brown spot that was nearly round in water. The lesions are limited to veins by polygons. When the humidity is high, the leaves overflow with milky white muddy watery bacilli. After drying, they have white marks. The diseased parts are brittle and easy to perforate, which is different from downy mildew. Stems, petioles, and tendrils infected, water-soaked spots appeared at the infestation points, and they expanded longitudinally along the stem sulcus and showed short strips. When the humidity was high, white fungal pus was also seen. Severe longitudinal cracking was rot-like, rotten, and brown and dry. Surface residual white marks. The melons were infected and there were small spots of water immersion. After the expansion, irregular or contiguous, the disease department overflowed with a large number of white bacteria and pus, and the infected melon strips were often accompanied by soft rot pathogens and the infection was yellow-brown water stain decay.
Second, the incidence of law. Cucumber bacterial angular spot is a bacterial disease that occurs on the seeds or in the soil with the diseased body. Bacteria in the soil spread by splashing as they flood, and new bacteria are spread by wind and rain, farming operations, insects, etc. The pathogens invade the host from wounds, stomata, and water holes and cause damage. The onset temperature is 24-28°C, and the humidity is more than 70%. Therefore, it is warm, rainy, low-risk, and continuous disease. The low temperature and high humidity in the greenhouse facilitate the onset; the temperature difference between day and night is large, the condensation is heavy and the duration is long, and the incidence is heavy.
Third, no pollution prevention
l, selection of disease-resistant varieties. Such as Jinchun No. 1, Jinyan No. 4, Zhongnong No. 11 and No. 13, Xintai Mickey and so on.
2, seed disinfection. Soak the seeds in warm water at 50°C for 20 minutes, then remove and soak in cold water for 4-6 hours, then sow germination; also use 72% agro streptomycin 3000-4000 times soaking for 2 hours, or 40% forma. Forest 100 times or 40% sodium hypochlorite 20 times soaking for 30 minutes, or soaking with 0.1% mercuric chloride solution for 5-10 minutes, rinse with water and germination.
3, soil-free seedlings and sorghum film. Seedbed soil should be fertile, loose, aerated, and well-absorbed by light, pathogen-free, egg-free, and non-weedy seeds. It is best to plant legumes, scallions, and vinegars. At the same time, sorghum-covered mulch is preferred for planting. it is good.
4, the implementation of rotation. Should avoid smashing, it is best to work with non-guay crops for more than two years to reduce pathogens and reduce disease.
5. Use high-efficiency, low-toxic, low-residue pesticides At the beginning of the onset, spray 72% of agricultural streptomycin 4000 times, or 14% of ammonia hydrothermal agent 350-400 times, neemectin wettable powder 4000 times, or 35% basic copper sulfate colloidal suspension 500 Double liquid, or 50% DT (Copper ferric copper) wettable powder 500 times, or 60% DTM wettable powder 500 times, etc., spray once every 7-10 days, even spray 3-4 times, can Received good control effect.
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