Scraping to eliminate diseases and insect pests of fruit trees do not neglect to scrape fruit trees in winter

Fruit tree scraping

1. A skinning object. Apple, pear, peach, plum, grape, walnut and other fruit trees are easy to produce rough bark, and adult fruit trees more than 10 years old should be scraped. Scrape off rough bark and warped bark cracks on tree trunks and backbone branches; thoroughly scrape off disease spots such as rot and ring disease.

two。 Shaving time. Skin shaving should be carried out in late winter and early spring when the temperature begins to rise, but when pests and germs are not active. Too early, after scraping off the old rough skin, the tender skin is exposed, which is easy to be frozen, which affects the safety of fruit trees; too late, the sap begins to flow and the pathogens begin to spread, which can not play the role of preventing diseases and insect pests. It is usually shaved once every 2-3 years.

3. Depth of scraping. Master the depth of scraping, general fruit trees scrape off the old rough skin, warped cracked skin, the depth is not white is appropriate, try to avoid damage to the endodermis. If the tree is strong, it can be scraped deeper; if the tree is weak, it should be scraped shallower, leaving no latent gaps in germs, insect eggs and pupae. Scraping the tender skin deeply, damaging the tree potential, scraping shallow has a great effect. For fruit tree rot and dry rot, scrape from the diseased skin to the woody layer, and the knife edge should be smooth, and the bark should be scraped into an edge to facilitate wound healing in spring.

4. Paint it white after shaving. After scraping, brushing with whitening agent can not only reduce frost injury, but also eliminate diseases and insects under bark and cracks, and reduce sunburn disease at the same time. The formula of whitening agent: 12 parts of quicklime (boiled with cold water), 3 parts of stone-sulfur mixture, 1 part of salt (boiled with hot water), 2 parts of bean powder (stirred with warm water), 40 parts of water, stirring to form a whitening agent.

5. Points for attention. Scrapers, fruit scissors, saws and other skin scraping tools should be washed and disinfected with Bordeaux liquid and other disinfectant. Bordeaux solution, 5% bacteria, 50 times sterilization, 2-3 times emulsion or 5-degree stone sulfur mixture and other anti-rot agents should be applied in time. In order to avoid infection, the whole tree can be sprayed with 3-5 Baume stone sulfur mixture or diesel emulsion with oil content of 4-5%. When shaving, plastic film should be laid under the crown in order to collect shavings and worms, burn them or bury them deeply. The whitening agent should be filled in a non-metallic container and should not be filled with a metal container to avoid chemical reactions.