Methods of preventing Pepper from falling Flower and Fruit in Spring

As the temperature changes greatly in spring and is in an unstable state, the pepper in the flowering and fruit-setting stage is easily affected by environmental conditions, resulting in falling flowers and fruits. There are many reasons for pepper falling flower and fruit, including physiological and pathological aspects. Chili peppers like dry air and moist soil, such as high temperature (more than 35 degrees), which affects pollination, fertilization, or rainy days for a long time, so that the light is insufficient and the temperature drops (less than 15 degrees). Will affect pollination and pollen tube elongation, leading to flower drop.

Dry soil, insufficient water and large air evaporation will also inhibit the plant's demand for fertilizer and water, resulting in falling flowers and fruits. Too much water and poor permeability hinder root respiration and growth, and even retting roots will cause falling flowers and fruits.

The application of fertilizer should be comprehensive, combined application of nitrogen, phosphorus and potassium, too much or insufficient nitrogen fertilizer or lack of phosphorus and less potassium, so that the application of fertilizer is not balanced, and the supply of various nutrients is not coordinated, which will cause flowers and fruits to fall due to lack of nutrients or nutritional disorder.

Planting is too dense, resulting in poor ventilation, insufficient light, weakened photosynthesis, poor development of male flowers, so that the flowers of the first and second layers are easy to fall off. The control measures are as follows:

First, carry out crop rotation. Select disease-resistant varieties, plant strong seedlings without disease and insect pests, do not hurt root and leaf seedlings, reasonably close planting, improve ventilation conditions, so that the plant has a good growth environment.

Second, strengthen the management of temperature and humidity. The ventilation rate should be increased in the flowering and fruiting stage, the greenhouse temperature should be maintained at 20-27 degrees during the day, and it can be ventilated day and night when the temperature is not lower than 15 degrees at night. Only with good ventilation can the plant grow vigorously and the fruit setting rate be high.

Third, strict control of fertilizer and water, rational fertilization. Topdressing can not be watered before fruit setting, so as to control vegetative growth and promote reproductive growth. when topdressing, we should increase the application of phosphorus and potassium fertilizer, reduce the amount of nitrogen fertilizer, enter the full flowering stage and fruit setting stage, and the fruit expands rapidly, then a large amount of nitrogen, phosphorus and potassium fertilizer is needed.

Fourth, control soil moisture. Chili peppers generally require air humidity of 55% to 65% and soil moisture of about 15%. If it is higher than 18%, it will affect root development and plant growth, but the soil should be kept moist at full fruiting stage.

Fifth, prevention and control of diseases. The main diseases of pepper are virus disease, anthracnose, cotton rot and so on. Virus disease can also make the plant shrink, can not branch growth, and seriously affect the yield. Virus diseases caused by aphids should be thoroughly and early controlled and eliminated in the spot stage, which can be controlled by imidacloprid, dimethoate and dichlorvos, and pupae can be controlled by mothicide or stone sulfur mixture. Virus diseases can be sprayed with virus A, plant disease spirit and so on.

Other diseases can be controlled by Purek, Metalaxel, Sukeling, Prodnisone, Carbendazim, carbendazim, Methyl topiramate and so on.

In addition to the above measures, hormone treatment can also be used, such as 2pyrine 4murD or anti-falling hormone, can play a role in preventing falling flowers.