今年8—9月,林业部林政保护司组织对主要进口樱花种植地(辽宁、陕西、浙江、江苏及北京、上海、天津市)的樱花病虫害调查。在北京1980年11月引进的1000株苗中,虫株率高达74%,主要由鳞翅目、同翅目、直翅目、膜翅目中15种昆虫引起。根癌病有些地方发病率高达80%,细菌性穿孔病发生也相当普遍。 From August to September this year, the Forestry Protection Department of the Ministry of Forestry organized a survey on the diseases and pests of cherry blossoms which are mainly imported into the cherry growing areas (Liaoning, Shaanxi, Zhejiang, Jiangsu and Beijing, Shanghai and Tianjin). Among the 1000 seedlings introduced in Beijing in November 1980, the worm strain rate was as high as 74%, mainly due to 15 species of insects in Lepidoptera, Homoptera, Orthoptera and Hymenoptera. The incidence of root cancer in some places as high as 80%, bacterial perforation is also quite common.