Squash gourd is a more difficult problem in production. Pomegranate refers to 3 to 4 days after the opening of the female flower of Zucchini, the young fruit's tip retreats and turns yellow, becomes thin and soft, the fruit does not swell or expand very little, the surface loses luster, and then shrinks, can not form a commodity melon, and finally rots or Shedding phenomenon. The main reasons that lead to pumpkins 1, fertilization, the temperature is not reasonable. The amount of nitrogen fertilizer is too large, watering is early, water is large, and the night temperature is high. The reason is that the pods are very prosperous and the ovary is small. Even after artificial flowering and 2,4-D flowering after flowering, the young larvae rarely expand. Yellowing away. This situation mostly occurs in the early melon period. 2, aging type melon. The soil was dry and the plants were senescent. The leaves were dark green and dull, and the young larvae wilted soon after flowering. 3, light is not reasonable. The zucchini enters the flowering stage. If it encounters continuous cloudy or rainy weather, the temperature difference between day and night is small, and the photosynthesis is affected, the consumption of nutrients is more than that of manufacturing, and malnutrition and melon will be produced. 4, disease. Mainly caused by gray mold mylon, even cloudy, flood irrigation, low temperature and high humidity are most likely to cause the occurrence and spread of gray mold. The preventive measures are as follows: 1, to control the water, increase ventilation during the day, the grass cover the appropriate late cover, reduce the night temperature, keep the film clean, spraying 0.3% potassium dihydrogen phosphate solution on the leaves, inhibit the leaves long. 2, timely watering, appropriate room temperature, timely sparse melon, especially the root melon to early picking, to prevent the roots of melons caused by a large number of melons. 3, add light. In the case of keeping the temperature inside the shed, it is better to pull the grass and rake the grass earlier. If you encounter continuous cloudy or rainy weather, you can use igniting the biogas lamp and stick the reflective film to strengthen the light. 4, hormone treatment. In the 2-3 days after the flowering of zucchini, spraying with 100ppm gibberellin or 100ppm of rhein can make the small melon grow faster, and it is not easy to melon. 5, drug control. Prevent flooding of large water, increase ventilation when the temperature permits, and reduce humidity. At the beginning of the flowering period, it is smoked and steamed with chlorothalonil smoke agent and fast-acting smoke agent, once every 7-10 days. When the female flowers are open for 2-3 days, if the residual seedlings are found to be wet when they are sitting, they should be promptly removed and the tip of the young fruit should be coated with grass ash. For greenhouses that cause severe disease in the gray mold, we must remove all the diseased melons, bury it deep in the greenhouse, increase the ventilation, reduce the humidity, and use 50% Suo Ke Ling 2000 times solution or Prodiocene 1000 times solution. The whole shed spray, can use the chlorothalonil smoke agent to fumigate at night. Heavy Biometric Safe Box,Double Door Safe Box,Combination Safe Box,Customizable Safe Box Hebei Yingbo Safe Boxes Co.,Ltd , https://www.ybsafebox.com