Cucumber bacterial blight, also known as vegetative disease, is a fungal disease that, once it occurs, is difficult to control and seriously threatens cucumber yield and quality. After several years of cultivation, the author has summarized a set of pollution-free comprehensive prevention and treatment of the disease, which is now described as follows:
First, implement a reasonable rotation and seed processing
1, a reasonable rotation. Interval 2-3 years with non-guarante rotation.
2, seed treatment. Before sowing, use 25% carbendazim WP 50 times, soak it for 30 minutes, and then remove it for air-drying. Seed can also be sown with a 0.3% dry weight of Fairchild.
Second, strengthen the cultivation and management
1, moisture management. According to the conditions of exposing the ground and protecting the land, reasonable irrigation is conducted. Under the conditions of open soil, irrigation should be controlled after the onset of disease, and drainage should be strengthened during the rainy season. Under protective conditions, due to the relative decrease in evaporation, the amount of irrigation should be reduced. In addition, root water before harvesting as little as possible, Shenggua period before and after the increase in water supply.
2, Reasonable fertilization, application of fully decomposed organic fertilizers, increased application of phosphorus and potassium fertilizers, improve plant resistance to disease. According to the law of fertilizer requirement of cucumber, formula fertilization was adopted to prevent premature aging of plants, and ammonium nitrate and diammonium phosphate were alternately applied.
3. Implement reasonable close planting. Determine the appropriate planting density based on the conditions of open and protected areas.
4, timely plant adjustments. When the whole vine is framed, it is not necessary to remove the side branch results in time, and the lower yellow leaves must be promptly destroyed before each vine. Part of the female flower is obsolete to balance vegetative and reproductive growth.
Third, chemical control
At the beginning of the disease, spray 75% chlorothalonil wettable powder 600 times, or 50% carbendazim wettable powder 500 times, or 70% thiophanate 500 times, or 70% mancozeb. Wettable powder 500 times, or 40% DuPont "Fuxing" EC 8000 times, spraying once every 3-4 days, even spray 2-3 times.
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