First, the incidence of disease law The root rot of the spotted root generally occurs when the roots of the fruit trees sprout at the beginning of spring. It is mainly the roots of the fruit trees that suffer from the rot of the soil and the survival of many kinds of Fusarium. Therefore, in orchards with extensive management, paying little attention to weed control, excessive fertilizer application, and insufficient organic fertilizer, the incidence is heavier, and the incidence of drought, lack of fertilizer, soil salinization, and soil compaction in orchards is also heavier.
2. Symptom identification The victim fruit tree begins with the fibrous roots and forms a reddish-brown round spot around the base of the fibrous roots. The lesions can be further enlarged and deepened, and can reach deep into the xylem, causing the entire roots to darken and die. Due to the different degrees of root damage, the upper part of the fruit tree tends to have symptoms of debilitating growth, yellowing of leaves, and wilting of branches and leaves. It seems that short of water and fertilizer are actually caused by the infection of pathogenic bacteria in the roots of fruit trees.
Third, control methods (a) to strengthen orchard management. Do a good job of pruning and pruning fruit trees, pay attention to pest control, timely weeding. (B) fertilization to improve soil. Increase organic fertilizers, improve orchard soil structure, and enhance soil permeability. (c) Chemical control. After spraying in the spring or after picking fruit, it can be mixed with 800 times liquid of green hen No. 1 or 300 times of Green Hunter No. 1 and thiram with 1:9, and the amount of liquid used is 20-30 kg per fruit tree.
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