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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(Alternaria tenuis Ness)为主,发生频率为76.3％,其次是极细交链孢菌(A.tenuissima Wil.)和麦根腐离蠕孢菌(Bipolaris sorokiniana Sacc.ex Sorok),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黑点病的发生程度。
Occurrence of wheat black spot disease in Henan Province, the main wheat area is relatively common, the pathogen is mainly Alternaria tenuis Ness (Alternaria tenuis Ness), the frequency was 76.3%, followed by the Alternaria Alternaria (A.tenuissima Wil. ) And Bipolaris sorokiniana Sacc. Ex Sorok, with frequency of 14.1% and 7.0%, respectively, and only 2.8% of other pathogenic bacteria. The three kinds of pathogenic bacteria caused by the black embryo rate, the symptoms and severity of the particles have significant differences. B.sorokiniana strongest virulence, A.tenuissima is also a strong pathogen in our country. The authors analyzed the reasons for the regional differences in pathogens, the first discovery that spikes damage aphids can aggravate the incidence of wheat black spot disease.