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苦楝(Melia azsdarach L.)是我国南方各省四旁绿化树种,也是广大群众主要用材树种。由于苦楝丛枝病的发生造成苦楝大量死亡。在浙江省临海县五十年代就有发生,近几年来蔓延较为严重。临海县第二中学种植苦楝400余株,发病率达50％以上,在该县发病较严重的生产大队发病率达80％。广州市石牌种植苦楝213株,发病率达84.5％,其他地区包括浙江省丽水地区、湛江市、福建省、江西省、江苏省、安徽省、湖南省亦有点片发生。川楝(Melia toosendan Sieb.et Zucc)亦受丛枝病为害。苦楝丛枝病的为害是当前发展苦楝的严重障碍。
Melia azsdarach L. is a tree species afforested along the southern provinces of our country and is also a major tree species for the broad masses. Melia cucumbers due to the occurrence of a large number of death. Occurred in Linhai County in Zhejiang Province in the 1950s, the spread was more serious in recent years. Linhai County, the second secondary plant more than 400 plants Melia, the incidence rate of 50% or more, in the county incidence of more serious production brigades up to 80%. 213 strains of Melia planting in Guangzhou Shipai, the incidence rate reached 84.5%. Other areas including Lishui in Zhejiang Province, Zhanjiang City, Fujian Province, Jiangxi Province, Jiangsu Province, Anhui Province and Hunan Province also occurred a bit. Melia toosendan Sieb.et Zucc is also harmed by the birch disease. Vicia gossypii damage is the current development of Melia a serious obstacle.