July is the Meiyu period of our province. The chances for heavy rain and heavy rain in various places have increased significantly. At the same time, the physiological fruit-dropping of red-fruited pomelo was ended one after another. The young fruit quickly expanded. It was the critical period for red meat and pomelo requiring fertilization. The occurrence of rust mites increased and a large amount of summer shoots were extracted. In order to protect the normal growth and development of red-fruited pomelo, The following management tasks should be done: (1) Fertilizer management In July, both the high temperature and the drought were easy, and the chance of heavy rain increased significantly. Therefore, all localities must pay special attention to the weather forecast of local meteorological stations. When drought occurs, they should be covered with straw in the tree tray, with a thickness of 15-20 cm, and the cover should be kept at a distance of 10 cm from the root neck. Care must be taken to prevent the water supply from being unbalanced. Cracking the fruit, at the same time, pay close attention to the occurrence of heavy rain. For red nectar or grapefruit gardens with typhoon storms or high groundwater levels, ditches should be trimmed to facilitate drainage. Application of strong fruit fertilizer is suitable for application within 1-2 weeks before autumn shoots. Young trees can be planted with 5-10 kilograms of human or manure, 0.2-0.4 kilograms of urea, 0.5 kilograms of superphosphate, 0.1 kilograms of potassium sulfate or potassium nitrate, to promote the growth of summer shoots, the growth of autumn shoots, and the expansion of the canopy. Such as weaker tree vigor, strong fruit fertilizer increase, or in the first half of July to potassium, nitrogen-based, with the application of phosphate fertilizer, the annual amount of 20% to 40% of the application, promote the development of autumn shoots neat. The red-pomelo teak tree which does not result in strong growth and has a small amount of fruit can be used less or not. (2) Controlling tip and thinning fruit Summer pruning takes place 15-20 days before the autumn shoots. The saplings remove the adventitious buds or sporadic shoots below the main branch, the main branch, and the short-stemmed long branches. The summer shoots pluck the second summer shoots or fall shoots to cultivate the tree structure and promote the expansion of the canopy. The first result tree is picked up or shortened by 25-30 cm or more. Appropriate short cuts for aging trees, promote new shoots, and rejuvenate the tree. The summer shoots generally occur in red tree pomelo trees with strong tree vigor or fruitlessness, and continue to erase the late summer shoots until mid-July. The aging trees and the trees with many results fade in the late July. After the physiological fruiting is over, early crops and thinning of fruit can be carried out for plants with many flowers, and small fruits, abnormal fruits, diseases and pests can be eliminated, and young fruits with normal development and balanced distribution in the crown can be retained to ensure the fruit growth and development. Normal, good appearance. (3) Pest control Because the temperature and humidity are suitable during the rainy season and the diseases are easy to grow, spread, and develop, attention should be paid to strengthening monitoring, active prevention and control, and timely prevention and control of disease if necessary. The trunk is covered with white, especially high-rising trees, to prevent the occurrence of resinous disease due to sunburn; there are individual copper peel or 5% leaves or fruit with rust, you can use 10% Liuyangmycin EC 1000-2000 times, 20% four Pyridazine 1500 ~ 2000 times liquid or narrow high-precision oil emulsion (such as green Ying) 150-200 times liquid and so on. Oil emulsions can also be used for both fleas and whiteflies. To improve the ventilation and light transmission of the tree canopy, cutting off dead branches is an important measure to reduce the occurrence of black spot disease. You can use 80% essential wettable powder 400-600 times, 80% Dasheng M-45 wettable powder 600 times, and 70%. Thiophanate-methyl wettable powder 500-800 times to prevent and control, pay attention to rain after 250 mm and then control once. Dasheng M-45 can treat rust wall niches. Continue killing, killing and killing moths with insecticidal lamps. The main traps were slaying and killing by hand, and the spoils were cut and burned. Http:// Enzymatic washing solutions provide a better and more
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