天水地区为小麦条锈病的常发区和许多小种的策源地,也是一些重要抗源品种的抗条锈性发生变异的地区,因而被称为“常发易变区”.为了进一步掌握天水地区小麦条锈病的发生规律,以便为制定该地区的综合防治策略和措施提供依据.我们自1986—1990年,对天水的区小麦条锈病流行规律中一些关键问题开展了进一步研究,并取得了以下结果:1)在夏季少雨、温度较高年份,病菌的越夏高度下限上移,一般在1700—1750m以上;而在夏季多雨、气温较低年份,其越 Tianshui area is the common area for stripe rust of wheat and the source of many races.It is also the area where the resistance to stripe rust of some important anti-source varieties has been mutated.Therefore, Wheat stripe rust in order to provide a basis for the formulation of integrated control strategies and measures in the area.We conducted a further study on some key issues in the epidemic law of wheat stripe rust in Tianshui from 1986 to 1990 and obtained the following Results: 1) In the summer when there is less rainfall and higher temperature, the lower limit of the summer altitude of the bacteria moves upwards, generally above 1700-1750m; while in the rainy summer with lower temperature,