Late-ripening citrus has to prevent fruit drop over winter
"Nowadays, late-ripening citrus is approaching the harvest time, but at this time, fruit farmers must remember not to take it lightly. Finally, look forward to the citrus ripening season of one year. Seeing that the ripening fruit may fall on the ground before harvesting, How to remedy the loss, and how to scientifically prevent low-temperature fruit drop?†Recently, in the villager activity room of Sundian Village, Wufu Town, Yilong County, Wang Daiyong, agronomist from the County Agriculture and Rural Bureau, was teaching villagers how to make late-ripening citrus fruit without falling fruit during the winter. skill.
Cause of fruit drop
Late-maturing citrus varieties are in the coloring period and mature period, and the fruit color is getting darker day by day. As the temperature drops, the temperature difference increases, and the citrus fruit drops in the partial separation layer. For example, fertile oranges, blood oranges, summer oranges, etc., due to the long fruit-hanging time and high nutrient consumption, the phenomenon of low-temperature separation of fruits often occurs in winter (fruit drop rate is about 5%-50%). This kind of fruit drop problem varies in severity. When it is severe, a large number of fruit drops seriously affect the output, and fruit farmers must pay attention to it. The specific reasons are as follows: First, the nutrients cannot keep up, calcium and potassium are insufficient, and the peel is easy to age. The fruit pedicle is cracked, which is susceptible to disease, and it is also easy to induce the formation of abscisic acid. Followed by low temperature, or low temperature, rainy and insufficient light. When the temperature is lower than 12℃, citrus is in a dormant or semi-dormant state, and its absorption capacity is sharply weakened. The citrus fruit consumes a large amount of nutrients, causing malnutrition in the tree body, and easy formation of abscisic acid, resulting in delamination of fruit. There is also the influence of drugs. Spraying strong alkali drugs, such as lime-sulfur mixture, can also cause serious fruit drop before harvest. Excessive concentrations of leaf fertilizer and spraying chemicals can cause phytotoxicity, stimulate fruit, and easily induce fruit drop. In addition, citrus canker, anthracnose, spider mites and other diseases and insect pests can also cause a large number of fruit drops in the later stage.
Prevention
The first is the preventive measures: spray, Liangguoan 300 times + Wofengsu 600 times + 150 times brown sugar + 300 times to 500 times Diliwang, can be compounded with 600 times potassium and 600 times calcium nitrate and spray 1 to 2 times together. Interval between 5-7 days; remedy: once freezing damage occurs, in the preventive spray program, the concentration of the Chinese herbal medicine Liangguoan can be increased to 150-200 times, and with Ralstonia solanacearum 150-300 times + Diliwang 300 times + 500 times of Wofengsu for root irrigation once.
Improve frost resistance
In general, the anti-freezing ability of fruit trees is related to their own nutritional level. Those with adequate reserves and healthy tree growth have strong anti-freezing ability. The high-energy substances and functional substances in Chinese herbal preparations (such as polysaccharides, peptides, amino acids) Etc.) It can be directly absorbed and utilized by plants to increase the content of cell soluble sugar, thereby enhancing the freezing resistance of plants. At the same time, the houttuyfonate contained in Chinese herbal preparations can repair tissue cells damaged after freezing damage, repair cracks, fried skin and other wounds caused by freezing damage, block the invasion of pathogens, and prevent pathogen infection. In addition, Wofengsu contains small molecular substances such as plant active glycoside peptides, which can promote the synthesis of protein and energy, increase the concentration, viscosity and elasticity of protoplasm, and improve its cold resistance.
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