Recently, the orchard focuses on the prevention of sunburn
The recent high temperatures have continued to face serious challenges in orchard management. Understand the impact of high temperature on fruit trees, and properly adjust orchard management measures to prevent early and symptomatic control. On this issue, the reporter interviewed Zhang Zhicheng, a miscellaneous fruit expert at the Northwest A&F University. He said that August was at a high temperature and was affected by persistent high temperatures and strong light. The fruit trees in direct sunlight were prone to sunburn. Reducing the damage caused by sunburn to fruit trees can avoid economic losses caused by high temperatures. Why is sunburn disease? Sunburn is a non-invasive physiological disease, a physiological disorder that occurs widely in fruit trees and is irradiated by strong light and high temperature. The occurrence of sunburn not only affects the quality of the fruit, reduces the rate of the commodity, but also affects the yield and causes a reduction in production. Fruits and leaves of apple trees, vines, kiwi trees, and winter jujube trees may be damaged to varying degrees. Symptoms Some experts divided the symptoms into 6 grades according to the severity of the sunburn disease. The grade 0 is completely sunburn-free, the grade 1~4 is a browning type sunburn of different degrees, and the grade 5 is a necrotic type day burn. According to different symptoms, the sunburn disease is divided into three types: whitening type, brown type and necrosis type. Examples of common diseases Examples of common symptoms of sunburn in several deciduous fruit trees: Figure 1, Figure 2, Figure 3, and Figure 4 show the damage performance of apple, grape, kiwi, and winter jujube. Control method 1 Select the disease-resistant variety Sunburn disease occurs in severe areas, and select the varieties resistant to sunburn. 2 The orchard roots are the most sensitive organs to the external conditions. The optimum temperature for root growth of most fruit trees is between 13 °C and 26 °C. When the temperature exceeds 30 °C or below 0 °C, the growth stops. Experiments show that the grass is grown. The summer surface temperature of the orchard is 3°C~5°C lower than that of the Qingyuan Garden. The grass and grass cover creates an ecologically optimal stable layer for the root system, thereby prolonging the growth time of the root system and promoting the absorption and synthesis of nutrients in the tree. 3 timely watering in early August is the longest period of high temperature heat damage throughout the year. Watering the apples, pears and peaches in a timely manner can improve the soil water supply and the demand for water by fruit enlargement, and alleviate the damage caused by drought and high temperature heat damage to fruit trees. Avoid large flood irrigation, should be small water and irrigation. 4 tree body water spray when the temperature reaches 35 ° C, can spray water to the tree body after 5 pm to cool and humidify, improve the orchard microclimate, relieve high temperature and direct sun damage to the tree and fruit. 5 Reasonable summer shears When trimming in summer, the leaves should be appropriately covered to cover the fruit to prevent sun exposure. 6 Build a protective net to reduce the damage caused by direct sunlight to fruits and trees. Disclaimer: Some articles on this website are transferred from the Internet. If legal rights of third parties are involved, please inform this website. phone Moisturizing Cosmetic Ingredients Youth Biotech CO,. Ltd. , https://www.youtherb.com