The use of tree dormancy to prevent and treat tree pests and diseases not only saves labor and medicine, but also has simple technology and good control effect. Doing a good job in the prevention and control of pests and diseases in dormant trees will play an important role in reducing the base number of disease and insects overwintering, reducing the pressure for prevention and treatment in the following year, and ensuring the yield and quality. The pest control techniques for dormant trees are described below as reference for forest farmers.
One, turn over the garden. Using the natural conditions of low temperature and drought in winter, through turning the garden, pests that overwintered in the soil, such as the moths and moths, turn to the surface of the soil and die, or are eaten by beneficial animals. The depth of the garden is 20-30cm. The better the time is, the better the effect of freezing the soil is. It can also be carried out in the early spring, but the control effect is worse than that of the early winter. In combination with turning gardens, applying insecticide powder on the soil surface can improve the effect of controlling pests in early spring. Gardening can not only eliminate overwintering pests, but also improve the physical and chemical properties of the soil and increase the ability of the soil to retain water and nutrients in winter.
Second, the Qing Qing Park. Some pathogens and pests of trees overwinter in fallen leaves, fallen fruits, dead branches and weeds. In the winter, the debris in the garden can be cleaned out by combining the gardens, concentrated and buried or burned to eliminate the germs and pests that have passed winter.
Third, cut pruning. In combination with winter pruning, the diseased branches, worm branches, and dead branches on trees are cut off and then burned together to eliminate the pathogens and pests that overwinter on the branches.
Fourth, scratch or scrape bark. According to investigations, there are many bacteria and insects in winter, such as some spider mites, pear pests and other diseases such as rot, dry rot, and ring rot. After scraping the bark, it is collected and burned or buried deeply to destroy germs and pests. Scrape the bark throughout the dormant season, but from the point of view of protecting natural enemies, it is advisable to scrape the bark when the enemy has been larvae in early spring and the pest has not yet been active. The site of scraping the bark includes rough skins on the main stem and main branch, mainly on the main branch. The degree of scraping bark should grasp the principle that small trees and weak trees should be light, big trees and busy trees should be heavy. Scrape dead rough skin. Scrapping bark can not only eliminate the winter diseases and insect pests in the rough cracks of trees, but also rejuvenate the tree. It should be noted that in the high-cold areas, scraping the bark as soon as possible, the tree is susceptible to freezing, but also is not conducive to the overwintering of natural enemies, should be scraped bark in late spring as well.
Fifth, spraying is spraying. Some germs and pests can survive winters in dead branches, fallen leaves, weeds, and soils, but they can also overwinter in other parts of the tree, such as wavy skin, round marks, and diseased buds. Therefore, they are commonly sprayed before germination. The solibal, a substitute for lime sulfur or stone sulphur in the 3 to 5° Be, is effective in preventing overwintering pathogens and pests.
Sixth, the coating is painted white trunk. Whitening can reduce sunburn and freezing injury, delay the sprouting and blooming of trees, protect trees from the harm of spring frost, and also treat trunk diseases and pests by killing overwintering eggs hidden in the bark. The commonly used whitening agent formulation ratio is: 10 parts of quicklime, 2 parts of lime sulfur stock solution, 1-2 parts of edible salt, 2 parts of clay, and 36 to 40 parts of water. In addition, some insecticides may be added. The number of whitening should be 2 times. The first time after the fall of the leaves to the soil is frozen; the second time in the early spring. The main part of the white area is the main trunk. The trunk of the incomplete tree crown, the diseased tree, and the trunk of the tree must be painted on the south side and the tree branch for the sunny side. The base of the main branch can also be painted white, but the whole tree should not be painted white so as to avoid burning. .
Seven, picking is to manually remove eggs. During the dormant season, the moths, moths, and leaf roller moths on the tree are removed and eliminated.
One, turn over the garden. Using the natural conditions of low temperature and drought in winter, through turning the garden, pests that overwintered in the soil, such as the moths and moths, turn to the surface of the soil and die, or are eaten by beneficial animals. The depth of the garden is 20-30cm. The better the time is, the better the effect of freezing the soil is. It can also be carried out in the early spring, but the control effect is worse than that of the early winter. In combination with turning gardens, applying insecticide powder on the soil surface can improve the effect of controlling pests in early spring. Gardening can not only eliminate overwintering pests, but also improve the physical and chemical properties of the soil and increase the ability of the soil to retain water and nutrients in winter.
Second, the Qing Qing Park. Some pathogens and pests of trees overwinter in fallen leaves, fallen fruits, dead branches and weeds. In the winter, the debris in the garden can be cleaned out by combining the gardens, concentrated and buried or burned to eliminate the germs and pests that have passed winter.
Third, cut pruning. In combination with winter pruning, the diseased branches, worm branches, and dead branches on trees are cut off and then burned together to eliminate the pathogens and pests that overwinter on the branches.
Fourth, scratch or scrape bark. According to investigations, there are many bacteria and insects in winter, such as some spider mites, pear pests and other diseases such as rot, dry rot, and ring rot. After scraping the bark, it is collected and burned or buried deeply to destroy germs and pests. Scrape the bark throughout the dormant season, but from the point of view of protecting natural enemies, it is advisable to scrape the bark when the enemy has been larvae in early spring and the pest has not yet been active. The site of scraping the bark includes rough skins on the main stem and main branch, mainly on the main branch. The degree of scraping bark should grasp the principle that small trees and weak trees should be light, big trees and busy trees should be heavy. Scrape dead rough skin. Scrapping bark can not only eliminate the winter diseases and insect pests in the rough cracks of trees, but also rejuvenate the tree. It should be noted that in the high-cold areas, scraping the bark as soon as possible, the tree is susceptible to freezing, but also is not conducive to the overwintering of natural enemies, should be scraped bark in late spring as well.
Fifth, spraying is spraying. Some germs and pests can survive winters in dead branches, fallen leaves, weeds, and soils, but they can also overwinter in other parts of the tree, such as wavy skin, round marks, and diseased buds. Therefore, they are commonly sprayed before germination. The solibal, a substitute for lime sulfur or stone sulphur in the 3 to 5° Be, is effective in preventing overwintering pathogens and pests.
Sixth, the coating is painted white trunk. Whitening can reduce sunburn and freezing injury, delay the sprouting and blooming of trees, protect trees from the harm of spring frost, and also treat trunk diseases and pests by killing overwintering eggs hidden in the bark. The commonly used whitening agent formulation ratio is: 10 parts of quicklime, 2 parts of lime sulfur stock solution, 1-2 parts of edible salt, 2 parts of clay, and 36 to 40 parts of water. In addition, some insecticides may be added. The number of whitening should be 2 times. The first time after the fall of the leaves to the soil is frozen; the second time in the early spring. The main part of the white area is the main trunk. The trunk of the incomplete tree crown, the diseased tree, and the trunk of the tree must be painted on the south side and the tree branch for the sunny side. The base of the main branch can also be painted white, but the whole tree should not be painted white so as to avoid burning. .
Seven, picking is to manually remove eggs. During the dormant season, the moths, moths, and leaf roller moths on the tree are removed and eliminated.
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