Fruit trees and pests are concentrated in the wintering place during the dormant period and early in the early spring, and the age of the insects is consistent, which is convenient for centralized annihilation, and is the weakest period of the year, which is easy to eliminate. The deciduous fruit trees have all the leaves, strong resistance, and the spraying is easy and even, which saves the pesticide effect. Therefore, the use of winter, early spring, favorable timing, combined with cultivation measures, prevention and elimination of pests and diseases, the best effect. The main measures are:
1. Plowing, adding organic fertilizer, and renovating irrigation and drainage facilities. The depth of ploughing should not be shallower than 60 cm, which can improve the soil structure, increase soil fertility, promote the growth and development of fruit trees, and enhance the ability to resist pests and diseases. The wintering pests in the soil are turned to the surface to freeze or die, some are eaten by birds and natural enemies, some are crushed by the cultivators, and the weeds, fallen leaves, and diseased fruits of the soil can be turned over. Deep into the soil layer, it not only increases the source of fertilizer, but also reduces the source of pests and diseases. In winter orchards, more organic fertilizer is applied after ploughing, which is beneficial to improving soil, promoting root development and improving disease prevention and insect resistance. At the same time, the winter ploughing and ploughing combines the irrigation and drainage facilities of the orchard, and the dry irrigation and sputum can be discharged, which is conducive to the growth of fruit trees, resistance to diseases and insects, and fruitful results.
2. Trim, scrape, and white. Reasonable pruning can make the orchard ventilate and transmit light, the tree body can be reasonably burdened, prevent years and years, and enhance the ability to resist pests and diseases. Pesticide nets suggest that when pruning, cut off pests, shoots, shoots, etc., and burn them deep into the burial. Protect the pruned wounds with Bordeaux liquid to reduce the invasion of bacteria and the prevention and control of pests. In winter, the branches, skins, skins, and skin lesions are scraped off, and burned, and the red spiders, heartworms, star caterpillars, armyworms, etc., which are overwintering in the cracks of the skin, and trunk diseases such as dry rot and decay and ring rot are eliminated. Both have better control effects. After the skin is scraped, it should be evenly and whitely painted.
3. Chemical control. In the late stage of fruit tree dormancy, the tree body was sprayed once with a purple oil emulsion containing 4% oil content, and then sprayed once a day for about 15 days, and the number of occurrences of fruit trees and pests was significantly reduced. For the dried pests, the beetles, etc., were diluted with a contact pesticide to form a 50-fold solution into the pupil.
According to the China Pesticide Network , the temperature in the early spring gradually rises, and the fruit trees gradually release their dormancy. All kinds of pests and diseases begin to infect first and infest the hazards. At this time, according to the specific types of pests and diseases, the corresponding counterparts should be sprayed to concentrate on killing. Off.
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