In summer, the pear tree grows vigorously. This period is not only the rapid expansion of the fruit, but also the flower bud formation period. The management of this period is not only related to the harvest and harvest of pear fruit this year, but also related to the quantity and quality of pear flower next year. . This management focus on the following three things:
First, fertilizer management
On the basis of fertilization in autumn and winter, a flat nitrogen, low-phosphorus, high-potassium fruit compound fertilizer was applied before flower bud differentiation from late May to mid-June, and water was applied in time after fertilization. The amount of fertilization should be based on the age of the tree, the strength of the tree and the number of results. The optimum amount of fertilizer should be determined based on 0.5 kg of pure nitrogen, 0.25 kg of pure phosphorus and 0.5 kg of pure potassium per 100 kg of fruit produced per year. Combined with spraying, foliar application of 1% urea water, 0.3% amino acid compound fertilizer solution, 0.2% potassium dihydrogen phosphate solution to supplement tree nutrients and enhance leaf photosynthetic capacity.
In the rainy season, the rainwater increases, and it is necessary to properly irrigate the water according to the soil moisture. The watering should be poured in small water to prevent flooding. After the heavy rain, it is necessary to promptly eliminate the accumulated water in the garden, and prevent the rain from soaking to cause the roots to rot.
Second, pest control
Focus on prevention and treatment of "two diseases and four insects", namely pear black spot disease, ring disease, Tenebrio molitor, pear hibiscus, Kang's whitefly, and heartworm.
Pear scab: usually check frequently, timely discover and completely remove diseased leaves, diseased branches, eliminate the source of disease; according to the condition of timely spraying, 40% DuPont Fuxing 10000 times solution or 10% difenoconazole 3000 times solution .
Ring disease: Hanbang 50% carbendazim 2000 times solution or 68.75% DuPont Yibao 1200 ~ 1500 times solution.
Tenebrio molitor: 10% red storm (imidacloprid) 1500 times solution or 20% acetamiprid 3000 times solution + 4.5% beta-cypermethrin 1500 times solution.
Pear hibiscus: 2.0% avermectin 3000 times solution + 4.5% beta-cypermethrin 1500 times solution.
Kang's whitefly: 40% chlorpyrifos 1500 ~ 2000 times liquid + kill 1000 times liquid, or 205 Kang's powder 2000 2000 times liquid.
Carnivorous worm: 1000-1500 times solution of chlorpyrifos 3 + 4.5% beta-cypermethrin 1000-1500 times solution or 1% carbaryl salt 1800 times solution.
Third, summer pruning
Summer pruning is a supplement to winter pruning. Doing a good summer pruning is beneficial to control the over-expansion of trees, promote flowering and improve ventilation and light transmission conditions. For the tree with normal results, it is necessary to strictly control the dense branches and the shoots on the backbone branches, and comprehensively use the methods of topping, folding, branching, and pulling branches to adjust the tree potential and angle of the backbone branches, and timely cut off the erect branches and cross branches. Diseased insects.
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