The cycle of fruit tree rot occurs, beginning in the summer each year. From the middle of June onwards, the bark of the diseased part gradually formed a scale-like natural skin layer, which entered more than seven months. In mid-season, the skin layer gradually discolored and died. Summer is a period of strong growth of apple trees. It is not an opportune time for the spread of rot disease. However, this kind of skin layer provides good invasive conditions for pathogens. The bacteria that invaded the bark first settled here and continued to invade, resulting in lesions in the skin layer. , The formation of superficial ulcers. Since the temperature dropped in early November, the fruit trees have entered a dormant period and their viability has weakened. The vitality of pathogens has only increased. They have invaded healthy subcutaneous tissues and formed multiple necrotic sites. After entering the deep winter, the spread of germs has slowed down until the following year. Outbreaks were most pronounced in March, and they did not end until May.
In the summer, there are two main measures to prevent rot: one is to scrape the skin and scrape the lesions and hidden germs on the tree. It is best until the end of July. When scraping the skin, a sharp scraper was used to remove the diseased bark to a depth of about 1 mm to expose the white-green or yellow-white cortex. The lesions are severely scraped to the xylem. Remember that at the same time the scrapings must be scraped to remove a good skin about 1 cm from the periphery of the lesion; after shave, use 4% of green shield and 120 of antibiotics or 2 of bacteria and kill bacteria (9281) 3-6. The letter liquid brushing, after the drug is dry, the entire surface is coated with the sealing oil, the effect is most ideal. The second is spraying spalling agent. Seriously ill orchard or seriously ill fruit tree. In the summer (June to July) when the skin layer begins to develop, it is pervious to the main stem, the main branch, the middle and lower parts of the big branch, and the large modified branch and the wound. Residual fungicides with a long residual effect, such as bacteria killing special No. 2, green twigs rot rot, bactericide poisoning, rot must clear, etc., sprayed 2-3 times, interval 7-10 days. Can also be used sterilizer 30-50 times thicker 2-3 times, smear surface to be large.
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