Prevention and treatment methods for autumn and winter diseases and diseases of fruit trees 1. Deep-turning land: It is an important measure to improve the soil and promote fruit tree production, and it is also an effective method to eliminate overwintering pests and diseases. The pests and pathogens that can turn to the surface of the ground can be frozen, dried or eaten by natural enemies, so that the insects that are buried underground can not be feathered and exhumed, and the overwintering base number can be reduced. Second, remove the branches and leaves of pests, weeds: combined with pruning to cut off the disease slightly, a little insect, and the orchard and surrounding weeds and litter removed, concentrated burned or buried, you can eliminate a large number of overwintering pests. Third, scraping bark: Fruit tree rough skin, cracks and trunk cracks, often lurking with a large number of wintering bacteria and pests. Practice has proved that winter scraping bark has a good control effect on a variety of pests and diseases. Fourth, the trunk white: not only can prevent the fruit trees from burning and freezing damage, but also can eliminate a large number of pathogens and pests that overwinter on the trunk. The proportion of whitening agent is generally: 10 parts of quicklime, 2 parts of lime sulfur, 1-2 parts of salt, 2 parts of clay and 35-40 parts of water. For the first time after the leaves of fruit trees are defoliated, until the soil is frozen, the second time in the early spring of the second year. 5. After the autumn, the grass is tied to a large branch of a fruit tree or broken into sack pieces to trap pests and larvae to overwinter, and then to concentrate on killing. This method has a 47-78% effect on the trapping of P. edulis and P. edulis, and it also has a good trapping effect on red spider mites and date stickworms. 6. Spraying: Deciduous fruit trees are dormant, spraying 1-2 times of diesel oil emulsion with oil content of 4-5% and lime-sulfur mixture of 5 Baume degrees, which will rot various scale insects, red spiders, and apples that damage fruit trees. Diseases, pear tree scab, grape black spot disease, etc. have significant control effects.
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