Fruit tree scrape rough early spring

Curing the rough and rough skin of the fruit tree can effectively prevent the occurrence of rot disease and ring rot disease. It can eliminate a large number of fleas, germs, and eggs that have passed through the winter in the old skin and restore the vitality of the weak tree. Scrape rough skin can be done in the dormant period before fruit defoliation to germination. Practice has proved that scraping skin in the early spring is better than winter, especially in the cold regions, and it must be scraped in the early spring to prevent freezing. Since many natural enemies start to move earlier than pests, in order to protect natural enemies, it is appropriate to postpone scraping before budding.

Which trees are suitable for scraping? Old trees, premature death trees, and old saplings require scraping. The main part of the skin scraping is the trunk and the base of the main branch.

Scrape rough skin should master the principle of "Lulu is not white", that is, it is better to scrape red endothelium. Not showing red means that the shave is light, and the white shows that the shave is deep, the former is ineffective, and the latter is weakening the tree. Tree species, different ages, different levels of scraping skin, such as white dragon apple trees should be heavy, red Fuji apple trees should be light; old trees, premature aging trees should be more heavy, deep, early fruit trees should be shallow, lighter.

After the scraping of fruit trees, the affected part should be coated with thiophanate-methyl or 5 degree lime sulfur or whitening agent (calcare: water: lime sulfur mixture: table salt = 10:36-40:2:1-2) to prevent the invasion of bacteria.

When pests in orchards are serious, it is important to consider protecting natural enemies. In the first year of the winter, the old rough skins on the top of the three main branches can be scraped first and burned or buried deeply. In the spring of the following year, the rough skins below the middle of the three main branches and the trunk will be scraped off again, and the scrape will be stacked first. In the vicinity of the orchard, the pests will be burned or buried after the natural enemy is released and the pests have not yet been active.

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Chitosan is a product of n-deacetylated chitosan. Chitin, chitosan and cellulose have similar chemical structure. Cellulose is hydroxyl group at C2 position, chitin and chitosan are replaced by an acetyl group and an amino group respectively at C2 position. Chitin and chitosan have many unique properties such as biodegradability, cell affinity and biological effect, especially chitosan containing free amino group, which is the only basic polysaccharide in natural polysaccharides.

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