Generally, in July and August in the northern regions, in the case of high rainfall and high temperatures, if the improper management of fruit trees leads to leggy, it is necessary to strengthen human control, mainly to do the following aspects: Fertilizer trimming control Fertilization. Less or no nitrogen fertilizer, for the results of many, weak growth of the tree should be appropriate topdressing phosphorus, potassium fertilizer, while the whole park spray potassium dihydrogen phosphate 300 times, spray once every 15 days, continuous spray 3 to 5 times. Summer cut. Timely cleaning of dense branches, weak branches and legged branches, timely picking of hearts to facilitate ventilation and light transmission, as well as control of branches with less results, overgrown branches, and to be compressed during winter shearing. After trimming, smear the anti-corrosion film on the trim mouth to sterilize and protect the wound from healing. Chemical control. With little or no accelerator, use plant growth balance agents and retardants as appropriate. Method is: in the trunk or the main branch of the tender skin around the ring, the depth to just reach the xylem degree, in the ring cut smear Hua Hua Wang 2 (except peach), control the shoot control crown, prevent the size of the year. Combined weeding cultivator loose soil In the rainy season, weeds grow rapidly. Not only do fruit trees compete for water, compete with fertilizers, or hide places for pests and diseases, they must use timely weeding and herbicides, such as catching nets, paraquat and glyphosate. In addition, after heavy rains, surface compaction, soil moisture, oxygen deficiency, is not conducive to root growth, often causing poor growth of fruit trees, and even cause a large number of fallen leaves, so regardless of weeds, we must do a good job after the rain planning, can improve Soil permeability, but also to maintain soil moisture. Drainage combined with flood control and water saving A large amount of precipitation in time, though inconvenient for production management, has accumulated rainwater. The distribution of annual precipitation in the northern regions is very uneven. To use rainwater resources, dig reservoirs in orchards, use open drains to divert water, and collect as much rain as possible. In drought in successive years in North China, the awareness of flood prevention is weak. In the past, many drainage ditches have been abandoned and filled up. When precipitation concentrates, internal hail can easily occur. While impounding water, do not be paralyzed, and do a good job of preparing for the prevention of locust plague, and clear up the drainage around the orchard. In case of continuous precipitation, the plot will be discharged in time. Strict prevention of pests and diseases The rainy season is the peak of fruit tree disease. Therefore, strengthening the prevention and control of diseases in the rainy season is a key link in the management of fruit trees. Apple ringworm disease. Apple buffalo disease overwinters with mycelium, conidiospores, and ascaria shells in diseased branches. Spores were found in the rain and peaked in July and August. The rainy season is mainly controlled by chemicals. Generally, 40% anthraquinone omeprazole WP is used 400 times; 50% carbendazim WP 1000 times have good control effect. Apple anthrax. At the onset of the disease, brownish round spots appeared on the fruit surface and gradually expanded to brown or dark brown spots. Prevention and control should be based on the removal of bacteria source and strengthen the cultivation and management. Pay attention to orchard drainage in the rainy season, and remove the disease in the growing season. Pharmacy protection generally adopts 1:2:200 Bordeaux mixture; 50% retort special wettable powder 500 to 600 times; 80% anthrax Fumei wettable powder 500 to 600 times;
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