June corrosion rot is key

June corrosion rot is key

Apple tree rot disease is a devastating disease that often causes a significant reduction in fruit production and death. It is a major disease in apple production areas in northern China. Through the investigation, it was found that all the fruit areas this year are very serious and the onset time has been advanced. The disease poses a great threat to the development of production. It mainly affects the result tree. Saplings and seedlings are less likely to occur. Under normal circumstances, the apple tree is susceptible to disease after it enters the outcome period. The site of occurrence is mainly on the main stem, the branch on the branch, and the vicinity of the wound. The symptoms of the disease vary according to the season and the site of the disease. There are three types of ulcers, branches and fruit types.

The traditional method of prevention and cure is to protect the lesions after scraping the lesions at the onset of disease, but this method does not cure the symptoms. The following analysis was carried out. After the onset of rot disease (March-April, July-September), it was found that the disease was cured after the scraping of the lesion, but after a certain period of time or another year, a new disease appeared in other sites. . This shows that there is latent pathogenic bacteria in the new disease site itself, and further that the pathogen is transmitted through the rain to the site of the disease at a certain period of time, and the infection is latent. When the tree vigor is weakened, a new lesion appears. Many areas that are prone to new lesions have dead tissue. For example, there are stems on the main stem, dry dead skin at the branches, and dead tissue near the wound. The results of the expert study showed that the spore angle in the orchard can be seen from March to October, but it is highest in May-July and October. Each time it appears after the rain, spread by rain and insects. It is not difficult to conclude that germs can be transmitted from March to October, but the success rate of infection is the highest in June and October (because of the emergence of the skin layer, the two periods of the tree due to special physiological processes, weak resistance , Disease resistance and anti-infection ability decrease).

In addition to insisting on scraping lesions and cultivating tree vigor, prevention of rot disease requires prevention, which is to prevent germination of the surface of the bark before germination (before the formation of the skin layer in summer from June to July and before the onset of disease) and in late autumn. When dyeing is an important time for spraying. In recent years, through investigations and tests, it has been found that this measure is effective in reducing the occurrence of new diseases, and is one of the fundamental measures to combat rot. The specific approach is: In the middle of June and the middle and late October, in the main pole, the main branch in the lower part, branches and wounds near the wound, with Guinness 400 to 500 times plus soft water through 800 times coating or spray, the control effect can be over 90 %.

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