First, the symptoms of the disease mainly damage the seedlings, saplings trunk and branches. Lesions occur in wounds, bifurcations, and other sites. At the beginning of the disease, the lesions were water-soaked, and the diseased part was dark gray. Afterwards, it lost water and became lighter. The lesions are fusiform, nearly round, oval or irregular and vary in diameter. Lesions often connect together, the cortex is necrotic, and the sapwood turns brown. The late lesion bark often cracks. When the lesion wraps around a twig or tree trunk, the upper part of the lesion will die. Second, the pathogenic and pathogenic rules of the disease of the great spot ulcers with hyphae and conidia in the bark winter, winter hyphae formed in the fourth year of May to May conidia, conidia by wind, rain, insects and man-made Activities spread. The germs invade through wounds and natural holes. The disease began in the middle and early March of the following year. The disease occurred in the middle and late April. The lesions stopped developing in late May and did not develop in the autumn. Different tree species have different resistance to P. fuliginea. All factors that cause the weakening of tree vigor and reduced resistance are conducive to the occurrence of disease. III. Prevention and Control Measures (1) Establish a nursery in a disease-free zone, cultivate healthy seedlings, strengthen quarantine, and ensure good seedling quality. Disable serious planting of seedlings after afforestation or planting after cutting. (ii) Breeding disease-resistant tree species, selecting tree species suitable for local site conditions and climatic conditions, and exerting their own resistance to disease. (3) Minimize water loss in seedlings during afforestation, with the seedlings being planted, with less root damage and avoiding long-distance transportation.
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