The use of tree dormancy to prevent and treat tree pests and diseases not only saves workers and forestry diseases and pests information in the eighth period of provincial medicine, and the technique is simple and easy, and the control effect is good. Doing a good job in prevention and control of pests and diseases during tree dormancy plays an extremely important role in reducing the base number of overwintering of disease and insects and reducing the pressure of prevention and treatment in the following year. The pest control technologies for tree dormancy are now described below for reference by forest farmers.

First, do a good job trunking white

The whitening of trunks can reduce sunburn and freezing injury, delay the sprouting and flowering of trees, protect trees from the harm of spring frost, and also treat trunk diseases and pests by killing the overwintering eggs hidden in the bark. The proportion of commonly used whitening agents is: 10 parts of quicklime, 2 parts of lime sulfur stock solution, 1-2 parts of edible salt, 2 parts of clay, 36 to 40 parts of water, and a small amount of pesticide. 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 do not whiten the whole tree to avoid burning. .

Second, do a good job garden work

Using the natural conditions of low temperatures and droughts in winter, through overturning the garden, pests that overwintered in the soil, such as Yangsaurus moths, Yang small moths, and bamboo grasshoppers, are turned to the surface of the soil and froze to death, or are eaten by beneficial animals and eliminated. 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, spraying 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.

Third, do a good job pruning and clean garden work

After the trees have hibernated, the sick branches, worm branches and dead branches on the trees are cut off and then burned together. At the same time, with the help of the overturned garden, the debris such as fallen leaves, fallen fruits, dead branches and lower weeds will be cleaned up, and buried or buried deep to destroy the germs and pests that have passed winter.

Fourth, do a good job of tree scraping

There are many germs and wintering pests in the rough cracks of trees, such as some species of spider mites, roundworms, chestnuts and other pests and 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 the bark can not only eliminate the overwintering pests and diseases in the thick skin cracks, 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 vulnerable to freezing, but also not conducive to overwintering natural enemy insects, bark should be scraped in the late spring as well.

Fifth, do a good job of 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 cracks, round marks, diseased buds, etc. The 3~5Be lime sulfur agent has a good effect in preventing overwintering pathogens and pests.

Sixth, manual capture

It is the manual removal of eggs. During the dormant season, the moths, moths, and leaf roller moths on the tree are removed and eliminated, reducing the number of larvae in the leap year.

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