【摘要】 本文报道了1977年以来对洛夫林10、13等“洛类”品种有毒菌株的筛选、研究结果。继1983年发现条中28号后又陆续发现7个对“洛类”品种有较强致病力的条锈菌小种类型,可分为洛10、洛13两个致病类群。它们对我国鉴别寄生、生产和后备品种、高代品系、重要抗源的毒力均有重要区别,对 “洛类” 品种及其后代的毒力也不尽一致。证实两类群的出现和发展是“洛类” 品种“丧失” 抗条锈性的主要因素,提出了防止“洛类”品种“丧失”抗条锈性的对策。更多还原

【Abstract】 This is the report on the results of sifting and studying the races virulent to Yr9 varieties since 1977. CYR-28 was found firstly in 1983, and 7 more races have been discovered later.All these races can be divided into two categories: Lovrin 10 types and Lovrin 13 tyopes, between them there is significant difference in pathogenicity on the differentials, commercial varieties, stock varieties, important resistance resources, and also on Yr-9 varieties and their progenies.The emergence and development of these races is found to be the major factor for breaking down of the Yr-9 varieties.The protection counter-measures are discussed.更多还原