引言美国俄勒冈州关于梨树砧木的研究,由于F.C.Reimer在1915年的工作而开始大规模地展开,並且在1925年到1948年间以缓慢的速度持续进行。随着与砧木有关的梨树衰退病的出现,包括有病理学家、昆虫学家、线虫学家,土壤学家和果树学家在内,于1960年又重新开始了重点的研究。这些研究终究产生了一系列具有深远意义的论文,它涉及到火疫病、根腐病、抗虫性、病毒病、矿 Introduction Oregon’s research on pear rootstocks began in large scale with F.C. Reimer’s work in 1915 and continued at a slow pace between 1925 and 1948. With the emergence of pear-tree decline associated with rootstocks, including pathologists, entomologists, nematologists, soil scientists and fruit trees, major studies were resumed in 1960. These studies led to a series of far-reaching essays that dealt with fire blight, root rot, insect resistance, viral disease,