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杨梅根腐病发病时自细根开始变褐坏死，并逐渐向支根、侧根、根颈部和主干扩展，引起地上部树冠抽梢量减少，抽发时期延迟，盲芽增多，最后导致全树生长衰弱和急性青枯。解剖病根发现其维管束和形成层坏死。病原菌经分离培养、致病性测定和形态特征、培养性状以及寄主范围的研究，鉴定为葡萄座腔菌Ｂｏｔｒｙｏｓｐｈａｅｒｉａｄｏｔｈｉｄｅａ（Ｍｏｕｇ．ｅｔＦｒ．）Ｃｅｓ。＆ｄｅＮｏｔ．，异名为茶子葡萄座腔菌Ｂ．ｒｉｂｉｓＧｒｏｓｓ．＆Ｄｕｇｇ．无性阶段为小穴壳菌Ｄｏｔｈｉｏｒｅｌｌａｓｐ．．病菌人工接种时还能侵染桃、梨的根和枝干．
Myrica rubra root rot from the onset of browning necrosis, and gradually to the root, lateral root, neck and trunk expansion, causing shoots above the ground to reduce the number of shoots, pumping time delay, the increase in the blind bud, leading to the whole Tree growth is weak and acute withered. Anatomical diseased root discovers its vascular bundle and cambium necrosis. The pathogen was identified as Botryosphaeriadothidea (Moug.etFr.) Ces by isolation culture, pathogenicity determination and morphological characteristics, culture traits and host range. & DeNot. , Synonymous for the tea of Bacteroides spp. ribisGross. & Dugg. Asexual stage for the small fungus Dothiorellasp. . Germs can inoculate peach, pear root and branch when artificial inoculation.