1987年以来,在宁夏的盐池、灵武、银川、永宁等地的苹果树上陆续发现一种叶部病害。罹病苹果树的叶尖和叶缘,初呈现圆形褐色小斑点,随后扩展为不规则形灰褐色病斑,并散生小黑点,常引起叶片大量提早脱落。经镜检鉴定,该病的病原菌为宁夏首次发现的苹果叶枯病菌(phyllostictamali)。该病菌以菌丝体在罹病落叶上过冬,翌春 Since 1987, one kind of leaf disease has been found on the apple trees in Yanchi, Lingwu, Yinchuan and Yongning in Ningxia. The diseased apple tree tip and leaf margin, beginning with a small round brown spots, then expanded to irregular brown spots, and scattered small black spots, leaves often cause a large number of early shedding. The microscopic examination showed that the pathogen of the disease was the first phyllostictamali in Ningxia. The bacteria to mycelium in diseased leaves on the winter, the next spring