The planting of hot peppers in greenhouses is a very common problem. Generally, the flowering rate can reach 40%-50% and the fruit drop can be as high as 10%-20%. It is of great significance to reduce the falling and fruiting of the peppers. There are many reasons for falling flowers, but in the aggregate, they are mainly caused by malnutrition, unfavorable climatic conditions, and pest and disease damage. 1. Malnutrition Due to unfavorable cultivation and management measures, such as excessive planting density or excessive nitrogen fertilizer application, the plants are lengthy, the vegetative growth and reproductive growth are unbalanced, and the pepper and fruit nutrition are insufficient and fall off. In the cultivation of greenhouses, the peppers are easier to grow, so falling flowers and falling fruits are common phenomena. 2. Unfavorable climatic conditions In winter and spring, greenhouses often suffer from lack of light, and the temperature is low (less than 15°C), affecting pollination. Even pollination, the fruits are not stunted and fall off easily. This shows even more in cloudy and rainy days. prominent. In the late spring and early summer and early autumn, high temperatures above 35°C often occur in greenhouses, which can cause incomplete development of pepper flowers or dry stigma, and can not pollinate the flowers. Poorly ventilated greenhouses, when the humidity is too large, resulting in pepper powder can not be normal, so that fertilization is difficult to complete fertilization caused by falling flowers. Chili peppers are afraid of earthworms. The accumulation of water in the field can suffocate the roots for several hours, yellow leaves off, plants fall and fall, and the whole plant is dead. 3. Diseases and Insect Hazards After the onset of hot pepper, virus diseases, anthracnose, and leaf blight, etc., can easily cause flowering and fruit drop. If infected with virus disease, often appear dead top phenomenon, resulting in falling flowers and falling fruit; tobacco insects, cotton bollworm fruit capsule; also easy to fall off. To prevent falling flowers and falling fruit, we should start with strengthening cultivation management, mainly to cultivate strong seedlings, timely planting, rational close planting, and scientific fertilization. After the planting, the ventilation and dehumidification were strengthened. The daytime temperature in the shed was maintained at 25-28°C, 15-18°C at night, and the minimum period was 15°C. The shed promotes irrigation under the membrane. Do not flood the reservoir. Through scientific cultivation and management, improve the plant's resistance to stress, pay attention to pest control. In addition to the above measures, 40-50ppm tomato spirit, 5Oppm nicotinic acid spray, dip flowers, or 20-3Oppm 2,4-d can be used to apply flower stalks.
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