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期 刊 ：植物保护学报 1998年

关键词：小麦；黑点病；病原菌；致病力；

Keywords:wheat, black spot, causal organisms, pathogenicity,

摘 要 ：小麦黑点病在河南省主要麦区发生比较普遍，其病原菌以细交链孢菌为主，发生频率为７６．３％，其次是极细交链孢菌和麦根腐离蠕孢菌，其发生频率分别为１４．１％和７．０％，其它病原菌仅为２．８％。３种病原菌所致黑胚率、产生的症状和病粒的严重度均有明显的差异。Ｂ．ｓｏｒｏｋｉｎｉａｎａ的致病力最强，Ａ．ｔｅｎｕｉｓｓｉｍａ在我国也是较强的致病菌。作者分析了病原菌存在地区性差异的原因，首次发现穗蚜为害能加重小麦

Abstract:The results of four years‘ studies showed that black spot of wheat occurred very commonly in Henan Province. The chief cause of the black spot was Alternaria tenuis. The frequency of occurrence was 76. 1%. A. tenuissima took the second position and Bipola

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