Recently, some farmers in Rizhao and Penglai called on the phone and reported that the Red Fuji, Red Star, and Dew apple tree defoliation they planted were particularly serious. According to the author's survey, these days, continuous rainfall in Shandong, Hebei, and other places, coupled with continued high temperatures, the individual apple trees fell only fruit. In the survey, the author found out the reasons for the defoliation of apple trees, mainly due to the rain and the water in the park.
With continuous rainfall, the roots of the fruit trees are in a state of flooding for a long time, and they will cause bad rooting due to poor ventilation, affecting the normal growth of the fruit trees, and even the serious orchards of the accumulated water will even appear dead trees. Therefore, the orchards that have already experienced locust plague should be promptly drained and the management of the rainy backyard should be strengthened.
For an orchard with accumulated water, it should be drained in time. Clean out the mud within 1m around the tree tray to maintain the normal respiratory metabolism of the tree. The severely flooded branches should be cut off in time, go to leaves and fruit, reduce the amount of transpiration, and remove the deciduous fruit in the orchard. For an orchard that can't be cleared of sludge in a short period of time when the flooding is heavy, ditches should be made between the rows of fruit trees to reduce the groundwater level so that the orchard soil can maintain maximum ventilation. For particularly serious locust plagues, it is recommended to dry the roots of the trees and dry the roots around the tree plates to allow the water to evaporate as soon as possible. After 3 sunny days, cover the soil.
Throughout the orchard, when the soil is about to dry, intensive cultivation will be implemented. When cultivating, the depth should be increased appropriately. The depth of the cultivator is 20-25 cm.
As the fruit trees suffer from locust plague, the root system is in an anoxic stage for a short period of time. The root system is poorly developed and the fertilizer and water are difficult to absorb. Fruit trees are prone to defertilization and aggravate diseases. At this time, the fruit trees should be topdressed with a combination of rowing and cultivating. After the rain, the 0.2%-0.4% potassium dihydrogen phosphate solution should be sprayed on fruit orchards in time to promote coloration and improve fruit quality; 0.5% urea water should be sprayed on the unfruitful orchards to enhance photosynthesis. Increase tree nutrient accumulation.
In water orchards, nitrogen and potassium are easily lost with water. Therefore, after the relief of floods, a medium amount of high-nitrogen and high-potassium fertilizer should be generally applied to prevent and control detoxification of apples after rain, and the number of sprayings should be appropriately increased according to the disease conditions. , it is recommended to spray 1-2 times efficient germicide, such as 70% thiophanate methyl, Dasheng M-45, etc., to control the breeding of various germs. By adopting the above series of measures, it is possible to reduce the defoliation of apple trees and minimize the damage.
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