After bagging apples, management cannot be ignored. The focus of orchard management should shift to protecting the orchard, such as protecting leaves, promoting fruit expansion, controlling the growth of new shoots, adjusting ventilation and ventilation in the orchard, and adjusting soil moisture.
Control tip:
The new shoots not only compete with the fruit for nutrients, but also easily cause orchard closure, affect ventilation and light transmission, reduce fruit quality, and affect flower bud differentiation. Remove upright long branches and overdense branches on the back, and topping the new shoots at the same time. The number of toppings should not exceed 20% of the middle and long shoots, to prevent strips. Stop the long new shoots and twist them to promote flower formation.
Replenish phosphate and potash fertilizer by time:
Top dressing is an effective measure to promote fruit expansion. Mid-maturing varieties in mid-July and late-maturing varieties in mid-late August, mainly with phosphorus and potassium fertilizers, supplemented with trace element fertilizers. In the critical period of fertilizer and water, although there is not much fertilizer water in this period, a small amount of it can play an important role in the growth of apple trees and fruits throughout the year. A large number of elements NPK should be properly matched, and fertilizer and water should be integrated. At the same time, trace elements should be added to solve the problem of calcium and boron deficiency physiological diseases. The time of top dressing should be before and after fruit bagging. It is recommended to use a fertilizer gun or hole to apply carbon-based algae protein. Peptide + Haifa. Amli. For trace elements, it is recommended to use foliar spray fertilizer (fruit first red), supplemented with amino acid and other fertilizers.
Drought and waterlogging management:
In the case of drought, the soil moisture is reduced, the root system cannot grow normally and absorb nutrients, it will inhibit fruit enlargement, and may also cause bitter pox and other deficiency syndromes. In the rainy season, the occurrence of waterlogging will affect the normal development of the root system. Long-term waterlogging will also cause root hypoxia and death. It will also affect the plant's absorption of nutrients, fruit expansion and induced deficiency. Watering the apples 2-3 days before bagging can prevent the fruit from burning, change the microclimate conditions of the orchard, increase the temperature difference between day and night, and create night dew, which is conducive to fruit coloring. Therefore, in the orchard, to achieve drought, waterlogging, and drainage, it is best to use water-saving and water-saving measures such as micro-spraying and straw mulching.
Prevention and treatment of brown spot:
After the fruit is bagged, it enters the high-temperature and rainy season, and the apple brown spot disease enters a high incidence period. Prevention and treatment of apple brown spot disease should be strengthened to prevent early defoliation. It can be used alternately with organic bactericide and Bordeaux liquid. Generally, spray Bordeaux liquid at least twice. Organic fungicides can be used: 43% tebuconazole 4000 times, 10% difenoconazole 2000 times, 80% mancozeb 800 times, etc.
Investigate bugs:
After bagging, the main pests are red spider, white spider, aphids, leaf moth, heart-eater and so on. Pay special attention to the prevention of red and white spiders. In high temperature weather, the reproductive cycle of red and white spiders is shortened, and the spawning amount is increased. If the prevention effect is not good in the early stage, it is easy to break out in the later stage. . The agent can be used with 1.8% avermectin 4000 times, 15% pyridaben 1500 times, 25% triazoxide 2000 times and so on.
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