Boron does not accumulate in the tree and does not operate. Therefore, the symptoms of boron deficiency are very obvious. The following is a description of the diagnostic techniques for the lack of boron in apple trees:
1. Dry tip: When the early spring begins to grow, tipping occurs. By the end of the summer, the leaves on the shoots were brown, and the petioles were red, and the entire leaf was convex or distorted. Necrotic areas appear at the tips and edges of the leaves. The typical symptom is a small area of â€‹â€‹necrosis in the phloem and the formation layer at the tip of the shoot. This type of necrosis, which is common in the tissues below the leaf blade, causes the new shoot to die from the top and then expand.
2. Broomsticks: In spring, the normal buds seem to stop growing or grow very slowly and die shortly afterwards. The xylem of the victim's branches will gradually die from the top to the end of several years. Close to the death part, the inferior buds grow many abnormal twigs. These branchlets quickly die, stimulating the development of other sprouting branches, resulting in the formation of a broom-like shape. This type of boron deficiency can cause the entire plant to die within a few years.
3. Tufts of leaves: After the shoots have started to appear in early spring or late summer, very small, thick and fragile leaves grow from abnormally short nodes. Most of them are underdeveloped and the leaf margins are smooth without jaggies.
4. Dropping fruit: In the early stage of fruit development, a cork layer can be formed. Gradually necrotic areas appear on young fruit peels. The necrotic areas gradually harden and become brown. Afterwards, cracks and shrinkage of the pericarp occur due to fruit growth. And form a thin layer of cream, fruit early fall off, or still hanging on the branch.
5. Bitter fruit: Boron-poor fruit can be formed within the flesh within two weeks after flowering and at any time before harvest. Initially, a water-soaked area appeared in the flesh, and soon after that, it turned brownish and dried, forming a cork. If the disease occurs early, the affected fruit is deformed and falls early; if it occurs late, the fruit is not deformed, but there is a larger brown ulcer in the pulp. The brownish part of the ripe fruit has a bitter taste.
Because boron has the property of being unable to accumulate in the tree and cannot be transferred, it is determined that boron needs to be continuously supplied throughout the entire growth cycle of apple trees. This is why boron is more effective than Boron spraying in soils that are extremely deficient in boron. . Due to this nature, apple trees can suffer from boron deficiency at any time. In addition, because the effectiveness of boron is affected by many factors, different symptoms occur in the same tree block every year.
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