In order to prevent peach trees from dying, antifreeze should be done well in winter. The soil at the roots should be raised and the trunk should be painted white. At the end of February, 65438+ 10, winter irrigation was carried out to improve the fertilization structure, and base fertilizer was applied to peach trees in mid-August. Iron deficiency is the most direct manifestation of peach branches. The symptoms of nitrogen deficiency are green, and the leaves at the top of the new buds begin to appear. At first, the middle leaves turned green and yellow, the veins remained green, and the leaves were green and reticulate. With the increase of yellowing degree, the leaves at the top of the new shoot are all yellow and white, and the old leaves at the bottom also appear, and then necrotic spots appear on the leaves at the top of the new shoot. Brown focal spots began to appear at the edge of the leaves, and the leaves gradually died. In severe cases, leaves wither and fall off, terminal buds die, and even the whole plant dies.
In addition to the signs of leaf atrophy, there are also signs of fruit atrophy. In production practice, the key is to analyze what causes iron, nitrogen and other elements to be poorly absorbed, leading to withering. It is necessary to conduct on-site investigation and analysis on the orchard to see whether individual tree species are yellow or the whole plant is yellow. The sequence of analysis is from management, orchard environment, garden building, pruning and fertilization, from whole to part, and from top to bottom. In this way, the real yellowing phenomenon will be gradually eliminated. Stem ulcers rot, hindering the transport of nutrients. Branch rot causes local nutrient transportation to be blocked, which leads to local yellowing of peach trees, which is manifested by the yellowing of individual branches of a tree. In recent years, root rot caused by low temperature and freezing injury in winter has occurred from time to time, which will lead to sporadic tree weakness and yellowing of the whole tree in the orchard. Improper pruning will lead to yellowing.
Excessive pruning after fruit harvesting, before fruit harvesting, all kinds of organic and inorganic nutrients are mainly supplied for fruit growth, and root growth is inhibited. After the fruit is harvested, the root system urgently needs organic nutrients from leaves. At this time, the root system retracts and prunes, and a large number of nutrient branches and leaves on the ground are lost, which leads to insufficient nutrient supply for underground root growth and leads to the death of capillary roots due to excessive pruning. Roots can't absorb nutrients well, which leads to insufficient nutrient supply on the ground.