In the production of cucumbers in protected greenhouses such as greenhouses and greenhouses, the phenomenon of melon production has become heavier, resulting in decreased yields and reduced quality, which has affected the economic benefits of vegetable farmers and has become a major obstacle to cucumber production. To reduce the rate of Papaya, appropriate control measures can be taken for different reasons. First, the cause of the disease and conditions The occurrence of cucumber melons and climate and cultivation and management are closely related. 1. Over dense planting causes melons. 2. The higher the night temperature, the more nitrogen fertilizer applied, the stronger the respiration of the plants, resulting in longer and more severe disease, especially flowering fruit setting period, decreased photosynthesis, and the lack of nutrients in female flowers and young melons caused the melons. 3. The temperature regulation is irrational. Excessive temperatures and low temperatures can cause melons. 4. The lack of carbon dioxide in the shed creates pyruvate. 5. Picking melons is not timely. The melon strips are not harvested in time, affecting the balanced transport of nutrients to young larvae. 6. Spraying inappropriate pesticides or sprays with excessively high concentrations, or being poisoned by harmful gases, causing the normal physiological activities of the leaves to be destroyed, functional leaf dryness caused by pests and diseases, etc., the nutrients produced by the plants can not meet the needs of the melons , it will happen. Second, prevention and control measures 1. Select good varieties. It is advisable to choose special cucumber varieties cultivated in protected areas, requiring strong resistance to stress and disease resistance, such as Jinchun No. 3, Jinyou No. 3, and Zhongnong No. 13. 2. Reasonably dense planting. Colonization using large and small rows, 60 cm spacing, 40 cm spacing, 30 cm spacing, planting about 3,500 plants per acre, to improve plant ventilation and light transmission conditions, improve the utilization of light energy, and enhance plant resistance. 3. Strengthen fertilizer and water regulation. After the planting, the seedlings were planted with water, and then the seedlings were no longer watered and the main crop was middle tillage. In the root melon 15 centimeters long, promptly poured melon to promote drowning, and acres of application of nitrogen fertilizer available 15 to 20 kg. Into the melon period, 5 to 7 days, 1 water, 10 to 15 days to recover 1 fertilizer, watering should be poured shallow irrigation. 4. Adjust temperature and humidity to increase plant nutrition. The seedling period is maintained at about 30°C during the day and about 18°C ​​at night. The temperature is controlled at 25°C to 28°C during the day and 13°C to 16°C during the night at the seedling temperature. The temperature is higher than 30°C to reduce the ventilation and reduce the respiratory consumption. Increase ventilation and reduce humidity after each watering. Use supplemental carbon dioxide or foliar spray 1% glucose solution to promote assimilation and effectively control melons. 5. Improve the greenhouse and cultivation conditions. The dust on the film is often removed, and the condensation on the inner surface of the film is reduced by venting and other measures to prevent the refraction of light to increase the amount of transmitted light; under the premise of heat preservation, the opaque cover has to be exposed early to cover the cover to prolong the illumination. Time; a vertical light curtain is placed on the center column or on the rear wall of the facility to increase light. Timely adjustment of the plant, when the cucumber begins to spread, the scaffolding and binding vines, the old leaves, yellow leaves, excess male flowers and tendrils of the lower part of the plant are removed during the melon period so as to reduce the ineffective consumption of nutrients, make the plants receive light uniformly, and increase the photosynthetic efficiency . 6. Harvest in time. To remove the root melon as soon as possible and timely harvest the melon that reaches the maturity of the commodity, in order to reduce unnecessary nutrient consumption. For unusual melons, such as tapir melon, sharp-toed melon, etc. should be removed as soon as possible so as not to affect the growth of normal melon. 7. Comprehensive prevention and control of pests and diseases. In prevention and control, we must adhere to the principle of prevention and comprehensive prevention and control. Once the disease occurs, take effective measures and use it scientifically and scientifically. That is, the spray concentration should be appropriate, the spray should be uniform, try not to spray on the flowers, so as not to affect the pollination and melon.
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