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苦楝树丛枝病是海南岛近十多年来较普遍发生的病害,它引起了人们的注意。海南岛苦楝树丛枝病的症状是,枝条变扁、畸形、缩节丛生,叶变小、黄化。电子显微镜观察发现,在病株嫩枝和叶柄韧皮部筛管细胞超薄切片中,存在着大量的类菌原体(MLO)。菌体形态为圆形,椭圆形或不规则形,大小为70～500nm。由于在病株中普遍地发现有MLO存在,而健株组织则没有。可以初步认为,海南岛的苦楝树丛枝病可能是由类菌原体引起的。
Melia tomentosa bush disease is a more common disease in Hainan Island in recent ten years, it has attracted people’s attention. Melia azedarach disease symptoms in Hainan Island, branches become flat, deformity, shrinkage Cong, leaves smaller, yellow. Electron microscopy showed that there were a large number of mycobacteria (MLOs) in the ultrathin sections of the phloem cells of shoots and petioles of diseased plants. The cell morphology is round, oval or irregular, the size of 70 ~ 500nm. Because of the widespread presence of MLO in diseased plants, no healthy tissue was found. It can be initially considered that Melia azedarach on Hainan Island may be caused by Mycoplasma species.