研究各种区域化栽培和有前途品种的新毒性类型的发展动态,可为新品种揭示最危险的小种和生物型。直到六十年代中期,在免疫学实践中应用的主要原理是利用在生理学基础上筛选的一套标准的鉴别品种,来区分包括叶锈病在内的各种病原菌的种群.在国外,几十年前就已在抗病育种中应用了这些鉴别品种的 Studying trends in the development of new types of toxicity for various types of cultivated and promising varieties will reveal the most dangerous races and biotypes for new varieties. Until the mid-1960s, the main principle used in immunological practice was to use a set of standard discriminant species screened on a physiological basis to distinguish the populations of various pathogenic bacteria, including leaf rust, These identified varieties have been used in disease-resistant breeding