Apple tree canker disease, also known as bud rot, vegetative disease. Symptoms: The main damage to the branches, with 2 to 3 years of damage to the branches. Primary red-brown, round, small spots, gradually enlarged, with a central depression and raised edges, showing a spindle shape (Figure 1). There is a crack in the lesion. There is a dead branch or its branches in the center. When the air is wet, white molds are formed around the crack. In the later period, the diseased necrotic cortex fell off, and the callus resulting from bulging was generated around. In the following year, the lesions continue to spread outwards, and the lesions are spindle-like concentric lenticular patterns that grow in circles from year to year. There is a small number of sicknesses with an incidence of more than 5 years. The diseased part has more than 5 layers of spindle-shaped concentric ring patterns, and the more it goes to the central depression. In the later stages, the diseased nevus was shed on the necrotic cortex and the xylem was bare, with raised callus around it (Figure 2). In late spring, the lesions continue to expand. The damaged branches are easy to break. Incidence: The occurrence of the disease is related to the orchard's topography, management level, and variety. Low-level dampness, heavy soil, poor drainage, heavy nitrogen fertilizer, and excessive tree growth. There are differences in disease susceptibility among apple varieties. Da Guoguang, Xiao Guoguang, and Jin Guan are the most susceptible, Zhu Guang, Jin Jin, India, Liu Yu, and Gan Lu are more disease-resistant, and green bananas, rubies, marshals, and chicken cocks are resistant to disease. Control methods: 1. Strengthen cultivation management to increase tree vigor. Pay attention to drainage in low-lying water plots, apply no nitrogen fertilizer, reasonably pruning and increase tree vigor, and increase tree disease resistance. 2. Chemical control. According to foreign reports, when 50% of fallen leaves fall in the fall, 1.58% nitrated phenylmercury (PMN) is sprayed. 3. For other control methods, see "Apple tree rot disease."
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