After apple bagging, management can not be ignored. The focus of orchard management should be to protect the leaves, promote fruit enlargement, control the growth of new shoots, adjust the ventilation and ventilation of the orchard, and regulate the management of orchard such as soil moisture.
Bactericide for controlling brown spot
After the fruit is bagged, it enters the hot and rainy season, and apple brown spot disease enters a high incidence period. The prevention and control of apple brown spot should be strengthened to prevent early defoliation. Organic fungicides can be used interchangeably with Bordeaux mixture. Generally, at least two times of Bordeaux mixture should be sprayed. The organic bactericide can be selected: 4000% of tebuconazole, 2000 times of 10% difenoconazole, and 800 times of 80% mancozeb.
Investigate the situation of insects
After bagging, the main pests are red spider, white spider, aphid, leaf miner, and heartworm. Pay special attention to the prevention and control of red and white spiders. In high temperature weather, the breeding cycle of red and white spiders is shortened, and the amount of eggs is increased. If the early control effect is not good, it is easy to break out in the later stage. The leaves with serious damage to red and white spiders lose photosynthesis ability and even cause early defoliation. . The medicament may be selected from the group consisting of 1.8% avermectin 4000 times, 15% hydrazine 1500 times, 25% trizolium tin 2000 times, and the like.
Pay attention to controlling the new shoots
The new shoots not only compete with the fruit for nutrients, but also easily cause the orchard to be closed, affecting ventilation and light transmission, reducing fruit quality and affecting flower bud differentiation. Remove the erect long branches and overly dense branches on the back, and at the same time pick the new shoots. The number of toppings should not exceed 20% of the middle and long shoots, in order to prevent stripping, and there is more than 40 cm on the back. Stop the new shoots and carry out the twisting to promote the flower.
Supplementary phosphorus and potassium fertilizer
Topdressing is an effective measure to promote fruit enlargement. The mid-maturing variety is in mid-July, and the late-maturing variety is in the middle and late August. It is mainly based on phosphorus and potassium fertilizer and supplemented with trace element fertilizer. Potassium fertilizers mainly include potassium dihydrogen phosphate and potassium sulfate. Phosphorus and potassium fertilizers are generally applied by watering or foliar application. The amount used is taken as an example. The potassium dihydrogen phosphate or potassium sulfate 0.5 kg/plant is applied, and the potassium dihydrogen phosphate leaf spray concentration is 0.2%. .
Flexible management of dry pouring
In the case of drought, soil moisture is reduced, roots can not grow normally and absorb nutrients, which can inhibit fruit enlargement, and can also induce deficiency diseases such as bitter pox. In the rainy season, when there is damage, it will affect the normal development of the root system. If it is damaged for a long time, it will cause the roots to die of oxygen deficiency, which also affects the plant's absorption of nutrients, fruit enlargement and induced deficiency. Watering the bagged apples 2-3 days before picking up the bag can prevent the fruit from burning day by day, 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, it is better to use water-saving and water-saving measures such as micro-spraying and straw covering.
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