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1984年夏天,我们一行三人(还有两位森林昆虫学家)应邀访问了美国威斯康辛大学(麦迪逊)、明尼苏达大学,纽约州立大学(塞拉库斯)、费罗里达大学和加利福尼亚大学(伯克利),以及美国农业部林务局下设的北部林业中心试验站、西南太平洋林业试验站,还有印第安人自然保护区(林区)及私营公司的林场、苗圃等。在各大学主要是访问植物病理学系、昆虫学系和林学系(或称环境及森林生物学系,或称森林资源及保存系)。美国的国土面积大致与我国相若,但森
In the summer of 1984, our party of three (and two forest entomologists) were invited to visit the University of Wisconsin (Madison), the University of Minnesota, the State University of New York (Sierra Leone), the University of California, and the University of California (Berkeley), the North Forest Center pilot station under the USDA Forest Service, the South West Pacific Forest Experiment Station, the Native American Reserve (FOREST) and private company farms and nurseries. At each university, we mainly visit Plant Pathology, Entomology and Forestry (or Department of Environment and Forest Biology, or Forest Resources and Conservation). The U.S. land area is roughly the same as ours, but Sen