The apple stem blight is mainly responsible for the saplings that were soon planted. Ma Zhifeng, a professor at the Yangling Vocational and Technical College, reminded the disease to be prevented and treated earlier. Otherwise, the sapling's tree vigor will be weakened and even died, affecting the benefits.

Harmful symptoms Apple stem blight mainly damages saplings, mostly occurring 10 to 30 cm above the ground. In the spring of last year, an oval-shaped lesion of 2 to 5 cm in length is formed on the diseased ridge in the previous year. It is mostly split along the edge and sags. It separates from the tree. When the diseased part is aged, the edge curls up and the diseased skin falls off. When a spot is around a new shoot for a week, the emergence of branches can cause young trees to die.

Control methods Strengthen cultivation management, intercropping with high-stalk crops in the garden, whitening in winter to prevent freezing damage and sunburn; cutting off diseased shoots, removing diseased branches or lesions before conidia formation to reduce the source of infection. Scratch the lesions, especially before and after sprouting in the spring, and apply protection after scraping. For diseased fruit trees, branches should be cut off and taken out of the orchard. During the conidial release period, spraying 40% carbendazim suspension or 36% thiophanate-methyl suspension 500 times, 50% thiophanate-methyl sulfate suspension 800 times, once every two weeks, 50% mixed sulfur suspension 500 times.

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