Removal of pests and branches Many of the pathogens that injure fruit trees and pests are mostly wintered in dead leaves, grasses, and weeds. The trees are then planted the following year. Therefore, the fruit trees and nearby dead branches, fallen leaves, etc. must be cleaned up, concentrated or burned and combined with winter pruning to effectively eliminate these overwintering pests and bring the cut pests out of the orchard and burn them out.
Scrape bark, rough skin, cracks and trunk cracks are often lurking with a large number of wintering germs and pests. Scratches off rough skin, cracked skin, and diseased skin, and can receive good control effects. The best scraping time is in the late autumn and early winter; the depth of scraping is done with rough skin and diseased skin, and the light brown skin is suitable. When scraping the skin, plastic cloth is used under the tree to collect scraped bark. Out of the orchard was burned.
The whitening of the trunk not only prevents the sunburn and frost damage of the fruit trees, but also eliminates a large number of pathogens and pests that overwinter over the trunk. The whitening agent formula is: 10 parts of lime, 5 parts of lime sulfur, 2 parts of salt, 2 parts of clay and 30 parts of water, plus a small amount of insecticide. Whitening is better twice, once in late autumn and early winter, and once in late winter and early spring. When the trunk is painted, it does not flow, it does not curl up after drying, and it does not fall off.
Plowing land and irrigating the winter irrigated land can turn the deep soil pests and pathogens to the surface and be frozen to death, dry or eat by natural enemies, so that the insects buried in the ground can not be feathered and suffocated, thus reducing wintering. Base number. Irrigation in winter can drastically reduce the soil temperature and oxygen content, which is very beneficial for killing the root eggs and reducing the emergence of earthworms.
After trapping and killing insects, they are used to tie grass or break sacks on large branches of fruit trees to collect insect pests and larvae for winter, then concentrate on killing. This method has a 47%-78% trapping effect on P. edulis and P. edulis, and it also has a good trapping effect on S. spinulosa, P. rapae, and P. brassicae. When the density of overwintered worms was high in that year, the trapping effect was more pronounced.
Pharmaceutics prevent deciduous fruit trees from spraying 1-2 times of diesel oil emulsion with 4%-5% oil content and Baume 5 degree lime sulfur agent in dormant period. They are various kinds of scale insects, red spiders and apple rot disease, pears that harm fruit trees. Tree scab, etc., have a significant control effect.
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