Some orchards of apple orchards are strong and their growth is normal. In some orchards, after the apple trees are replaced with one another, the decline of the tree vigor, the quality of the fruit, and even the death of the branches have occurred. The phenomenon of abnormality after the apple tree was replaced by a high one was called Apple High Disease. The pathogenesis of high apple disease is the normal growth of apple trees in the year after they were harvested. The tree vigor has weakened in the following year. The fruit is very fruitful in the third year, but the fruit is small and the coloring is poor. After the fourth year, the tree vigor is very weak, and almost no blood is drawn. The new branch, and finally, found that when the apple tree was picked up, all the roots below the fingertips were found to be necrotic. High-risk disease is caused by a stem pox virus. Through the investigation, it was found that apple trees that have been traded high on the base stocks of Xinjiang wild apple and Malus japonica have no symptoms of high disease resistance, and almost all of the apple trees on the apple tree with the base of anthropods as a base have suffered Highly sick. Therefore, the following points should be made to avoid the occurrence of high-risk apple. First, the strong base of disease resistance should be selected, and high-risk virus-free apple varieties should be selected for scion. Second, for those apple trees that already have high-risk disease, bridging technology can be adopted, that is, planting 2 to 3 strains of virus-free, adaptable rootstock seedlings under diseased trees, and then surviving and then bridging high-risk disease trees. On the branch, to restore the tree potential. Third, apple trees that are extremely weak due to high disease levels should be removed in time to prevent the spread of the disease.
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