First, the symptoms. There are two main symptoms, one is that the leaf margin tissue turns gray and black and necrosis, and gradually expands inwards. There is no necrotic spot in the healthy leaf tissue, and the leaves fall off. The other is physiological potassium deficiency. A 1-2 mm brown necrotic lesion was evenly distributed on the leaves. The lesions and the edges of the healthy tissue were clear. The center of the larger lesion was grayish white, and the leaf marginal tissue grew normally and the leaves fell off. The deciduous tree defoliation develops from the bottom up and is initially thought to be pathogenic spot blight. Second, the distribution characteristics of the field. My field nursery has a variety of fast-growing poplars, including spring cutting in 2001, transplanting in spring of 2002, and spring cutting in 2002. The main varieties are 107 and 108 poplars, which contain other unknown varieties. In general, the leaves are unevenly distributed. However, in the above three types of seedlings, the severity of defoliation was significantly different; in 2001, the leafless leaves that were not moved were the heaviest; in 2002, they were transplanted second, and in 2002, the cuttings were lighter. In the field of transplanting in 2002, we found that the adjacent two plants with almost the same height and diameter were planted, one plant was almost completely covered with light, and the other plant was thick and green. The two strains are only different varieties, and the names of the varieties need to be verified. There was no significant difference in the degree of defoliation between the two varieties of 107 and 108 poplars. Third, the analysis of the reasons for falling leaves. Salt damage induces deficits in leaf margins caused by potassium depletion and defoliation. There are no necrotic spots in the center of the leaves as described in the symptoms; early defoliation of poplars occurred sporadically in 2002. This year's occurrence was more severe than last year due to the tree body. Roots grew underground as the age of the trees grew. The nursery was in the saline-alkaline soil area of ​​Tianjin Binhai, and the underground salt water level was relatively high. Generally speaking, there is salt water in the depth of 2-3 meters below the tillage layer. Both exceed three-thousandths of the irrigation water standards. The tree height is proportional to the depth of the root system. The tree age is long and the root system is deep. The more the root system distributed in the salt water layer, the heavier the salt damage performance. This is consistent with the results of field leaf defoliation performance between different tree ages. Pathogenic spot blight, contagious. The severity of its occurrence is closely related to tree vigor, rainfall, and accumulation of bacteria source. The accumulation of bacteria source in the nursery with a long age is very high. In addition, the rainfall in 2003 is early, the precipitation is large, and the air humidity is high, which is extremely favorable to the occurrence of this disease.

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