Scab any plant disease that produces dry raised scab like lesions due to the formation of cork layers.
疮痂病：由于植物木栓层增生而形成干燥、隆起、痂样创伤的植物疾病。
Meanwhile, paraffin-cut section method was used for studying on callus formation, cork cambium and vascular cambium initiation.
同时，运用石蜡切片法研究剥皮后愈伤组织的形成、木栓形成层和维管形成层的发生；
The formation of periderm is relatively late and cork cambium is come from the cortex cells which arenear endodermis.
周皮发生较迟，其木栓形成层由紧靠内皮层的皮层细胞产生。
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