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引言林木病虫害(真菌和害虫)从一个洲传进另一个洲的事例已有很多文件记载。在20世纪初期和19世纪末期,白松疱锈病菌Cronartium ribicola和栗疫病菌Cryphonectria(Endothia)parasitica随病株传进北美洲。他们播到美国的新寄主品种上,造成了严重的破坏。榆
Introduction There are many documented cases of forest pests and diseases (fungi and pests) passing from one continent to another. In the early 20th and early 19th centuries, Cronartium ribicola and Cryphonectria (Endothia) parasitica were introduced into North America with the disease. They sowed on new American host breeds and caused serious damage. elm