Good management of apple orchards in the rainy season
In July and August, during the rainy season, the temperature is high and the humidity is high. The climatic conditions are conducive to the spread of pests and diseases, which is a crucial period for preventing and controlling the damage caused by pests and diseases. At the same time, the new shoots of apple trees have also entered the second prosperous period, and fruit development has entered into the period of enlargement. It is a management focus of the period to do a good job of controlling the tree vigor and promoting the good development of young fruit. I. Pest control 1. Pest control. This period focuses on the prevention and control of red (white) spiders, leaf miners, leaf roller moths, apple aphids, and ringworm disease, anthrax, and early defoliation diseases. July is a critical period for the control of red and white spiders. It is necessary to take medicine according to the local temperature, rainfall, and occurrence. The commonly used agents are 1.8% avermectin EC 4000 to 5000 times and 5% CAG 1000 times. , 20% Suspension of a net suspension of 2000 to 3000 times, 5% Nissorene EC or 25% of DBP WP and EKT 2000 times; control of leaf miners and leaf roller moths should be 5 On the basis of prevention in June, in early July, medications were used for prevention and treatment. The commonly used agents were: 25% diflubenzuron 3x suspension 1500x, 1.8% avermectin 5,000x, 2.5% kung fu Or chrysanthemum 3000 times solution; apple cotton gills use 48% of Looseben EC 1000 times. 2. Disease prevention and control. In July and August, it is another crucial period for the prevention of ringworm disease, anthrax, and early defoliation. In the use of drugs, the bactericide and protective agent should be used interchangeably. Generally, protective bactericide is used before rain, and it is timely after rain. Spray systemic fungicide. The production of more full-bag cultivation, should focus on the prevention and treatment of early defoliation, usually in mid-July, early August and late August each spray a drug, the effective agent: Bordeaux mixture 1:2:200 ~ 240, 50% carbendazim WP 800 to 1000 times, 70% thiophanate-methyl wettable powder 1000 times, 70% or 80% mancozeb WP (Pink, Dasheng M-45) 600～ 800 times the liquid, 50% fluocin 1000 times, 10% polyoxoamphenicol 1000 times and so on. The use of Bordeaux mixture and one of the above fungicides alternately works well, and Bordopol is usually sprayed every 20 to 25 days. Red Fuji apple orchard sprayed three times in June-August and was deactivated in September to avoid affecting coloring. Second, the tree trend regulation July and August are hot and rainy seasons, suitable for the vegetative growth of apple trees, especially the early-fruitage young trees, less mature fruit trees of the summer and autumn Yi Yi flourishing growth, if not regulated, will affect flower bud differentiation, resulting in loss of nutrients, The disorder of the tree shape reduces the quality of the fruit. Therefore, appropriate measures must be taken to control it according to the age, tree vigor, and results, so as to maintain a strong growth of the tree. In the case of Wang Changshu, sprayed 150 to 200 times of paclobutrazol or 250 times of PBO is usually sprayed in each of early July and mid-July. For the young saplings (trees entering the fruiting period) that are not fruiting or fruiting less, the second circumcision of the trunk or main branch can be carried out in early July. At the same time, it is necessary to do a good job in summer pruning. The focus is to eliminate standing branches that stand upright on the back, long branches inside the branches, branches that compete on the branches, and useless branches that affect the light. Twist branches and put branches to soften the branches. To achieve control and prosperity, improve lighting conditions, promote fruit development and flower bud formation purposes. Third, watering and fertilizing 1. Top dressing. During this period, whether or not topdressing the apple tree is determined according to the variety, fruit setting amount, and previous fertilizer application. If it is determined that the apple tree is fertilized at this stage, a primary phosphorus and potassium fertilizer may be topdressed, with the emphasis on potash fertilizer and the amount of fertilizer applied. And set. On the other hand, mid-early-maturing varieties such as the US No.8 and Diao Lai can be fertilized in early July, and red Fuji apples can try to catch one fat from mid-July to mid-August. Since July and August are in the rainy season, if the weather is not dry, water can not be used to fertilize with rainfall. 2. Leaf spray fertilizer. Combination spraying of phosphorus, potassium, calcium, and iron fertilizers in the combination of medicinal herbs in July and August plays an important role in increasing the sugar content of fruits, promoting coloration, reducing the physiological diseases of fruits, and improving the photosynthetic performance of leaves and the quality of flower buds. Commonly used fertilizers are superphosphate, potassium dihydrogen phosphate, potassium sulfate, calcium chloride, calcium nitrate, ash and ferrous sulfate. In the production, potassium dihydrogen phosphate and calcium chloride are mostly used in combination, and the concentration of total salt (the total percentage of soluble fertilizer) is not more than 0.5%. 3. Orchard drainage, weeding. In the rainy season, the orchards cannot accumulate water for a long time, otherwise it will affect the orchard soil permeability and the growth of apple tree roots. After the rainfall, it must be drained in time to keep the orchard soil moisture relatively stable. After watering or raining, plan to remove the weeds in time. Rare Bird Feed,5Kg Rare Bird Feed,10Kg Rare Bird Feed,15Kg Rare Bird Feed Fenxi Kangruilai Biotechnology Co., Ltd. , https://www.kangruilai-petfeed.com