Cucumber 1. Symptoms: The melons do not grow into commercial melons, and the tops of the melons stop growing, forming a thin tip. 2. Causes: (1) Cucumber is weakly parthenocarpic and the female flower is not fertilized during flowering, resulting in poor nutrition at the tip of the fruit. (2) Insufficient supply of nitrogen fertilizer in the early stage of plant growth, making the stems of the plants thin and tough, and also producing pointed melons. (3) In the northern part of the greenhouse, there is insufficient illumination, the temperature difference between day and night is small, the plant density is too large, the light transmission is poor, and the supply of fertilizer and water is insufficient when the melon is expanded; (4) The plant grows weak, the leaves are small and yellow leaves, the growth point is inhibited, and the root system is damaged; (5) The plant grows senescent at the late stage of growth, or is harmed by pests and diseases, or encounters cloudy days; a leaf section grows a number of melons, and the growth is weak and easy to appear. 3. Prevention and treatment methods: (1) Create good pollination conditions during the flowering stage of cucumber, such as beekeeping, artificial pollination, etc. (2) Apply fertilizers with high nitrogen content such as urea. (3) Strengthen water and fertilizer management, increase the application of organic fertilizers, improve soil water supply and fertilization capacity, and prevent premature senescence of plants; (4) Reasonably construct the greenhouse, adopt high-efficiency and no drip film to increase the transmittance; (5) Reasonable close planting to ensure that each plant has sufficient nutrition and growth space; do a good job in pest control to prevent plants from being affected by pests and diseases.
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