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.
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.
Investigation and timely prevention and control of pests: The main pests after bagging 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.
Pay attention to controlling the growth of new shoots: the growth of new shoots not only competes with the fruit for nutrients, but also easily causes orchard closure, affects ventilation and light transmission, reduces fruit quality, and affects 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, in order to prevent strips. There is more than 40 cm of space on the back. Stop the long new shoots and twist them to promote flower formation.
Phosphorus and potassium fertilizer supplementation 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. Potassium fertilizers mainly include potassium dihydrogen phosphate and potassium sulfate. Phosphorus and potassium fertilizers are generally sprayed with water or foliar spray. The quantity used is the fruiting period as an example. Sprinkle potassium dihydrogen phosphate or potassium sulfate 0.5 kg/plant, and the potassium dihydrogen phosphate foliar spray concentration is 0.2% .
Flexible management of drought and waterlogging: Under drought conditions, the soil moisture is reduced, the root system cannot grow normally and absorb nutrients, it will inhibit fruit enlargement, and can also cause bitter pox and other deficiency diseases. 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.
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