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由传入的外来病原菌引起的病害对植物病理科学具有重要影响。栗疫病和荷兰榆树病以及其它由传人的外来病菌引起的病害在美国的毁灭性植物病害中占据着中心位置。虽然植物病理学家给传入的外来病菌及其病害以足够的注意
Diseases caused by incoming foreign pathogens have a major impact on plant pathology. Chestnut blight and Dutch elm disease and other diseases caused by transmitted exotic germs occupy the center of devastating plant diseases in the United States. Although phytopathologists pay enough attention to the introduction of exotic germs and their diseases