洛10、洛13致病类群的发现与研究

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。

THE DISCOVERY AND STUDIES ON PHYSIOLOGICAL RACES OF WHEAT STRIPE RUST VIRULENT TO LOVRIN 10 AND LOVRIN 13

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.