Planting cucumbers in greenhouses in winter often leads to melon phenomenon. The melon strips grow to 2-5 cm in length and stop growing and wilting. First, the cause of melon 1. Poor breed ability. Cucumbers are cross-pollination crops. Because of the large temperature difference between day and night in nursery and early growth stages, protected areas have many female flowers, few male flowers, and lack of pollinators in the interior. If artificial pollination is not performed, it will be easier to melon. 2. High temperature. The daytime temperature in the protected area is higher than 32°C, and the nighttime temperature is higher than 18°C, it will cause the photosynthesis of cucumber to be blocked, and the respiration will be strengthened, resulting in malnutrition and metamorphosis, and sometimes malformation. In the early stages of the melon, the stems and leaves grow rapidly, and the melon strips grow slowly. If there is a high temperature of 20°C in the evening for 2 to 3 days at a time, the nutrition will be largely lost to the stems and leaves, so that the melons grow long and lead to melons. 3. Cold damage. If we ignore the defense against low temperature chilling, it will lead to lower absorption capacity of cucumber roots due to the influence of low temperature chilling injury, so that the supply of melon strip nutrition is insufficient. 4. Low carbon dioxide concentration. Cucumber is very sensitive to the change of carbon dioxide gas concentration, if the carbon dioxide concentration is too low, it will be easy to melon. 5. Unreasonable density, improper management of fertilizer and water. The density is too large, the supply of fertilizer and water is insufficient, roots compete for nutrients, stems and leaves compete for space, light transmission, poor ventilation, low photosynthetic efficiency, and increased consumption. Excessive nitrogen nutrition causes various factors such as cucumber growth to cause melon. 6. Root melon harvesting is not timely. 7. Insect pests. Diseases such as downy mildew, gray mold, powdery mildew, anthracnose and keratopathies affect the leaves and affect photosynthesis. Synthetic nutrients are reduced and metabolized; maggots and whiteflies are also harmful. Second, control methods 1. Select suitable varieties, and increase fruit setting rate through artificial pollination, bee-keeping and other measures. 2. Grafting seedlings and cultivating strong seedlings. 3. Adjust temperature and humidity, improve lighting conditions. Strengthen air management and control the temperature within the range suitable for normal growth and development of cucumbers. The cold days can be small, and the warm and sunny days can be amplified. The use of high-transmittance non-drop film, as long as possible to extend the light time, and pay attention to cleaning the film surface to facilitate light, artificial light at night with a fluorescent lamp and other light sources. 4. Reasonably apply fertilizer and water. Do not apply nitrogen fertilizer quickly before sitting on roots. If the plant growth is normal after easing the seedlings, no watering is done for the seedlings, until the roots reach a thick finger and then watering and foliar spray fertilizer, and timely ventilation and dehumidification. Foliar spray fertilizer can use 1% potassium dihydrogen phosphate + 1% glucose + 0.3% urea. 5. Adjust the plants in time. Retain the lateral branches with female flowers above the root melon section, and leave 1-2 leaves to pick up the heart above the female flower. Other side branches and tendrils should be removed in time. It should also be ventilated in time to ensure the concentration of carbon dioxide. 6. Strengthen pest control. 7. Harvest timely. The cucumber root melon has a longer growth period and should be harvested in time to avoid falling into the eel, and abnormal melons such as "diglon melon", "sharp beak melon" and "beak loin melon" should be removed as soon as possible so as not to affect normal melons. Grow.
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