Septoria nodorumon Barley and Relationships Among Isolates from Several Hosts

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Abstract
The causal agent of a leaf spot and glume blotch of barley [Hordeum vulgare] and little barley (H. pusillum) in Georgia [USA] was identified as S. nodorum. Symptoms are described. Conidial morphology of isolates from both hosts was identical to that of isolates from wheat and triticale. Isolates from barley and wheat were highly virulent to their original host but weakly virulent to the opposite crop in reciprocal inoculations. Isolates from H. pusillum were pathogenic to all 4 plant species. Isolates from triticale were similar to those from wheat by all criteria tested. S. nodorum was isolated from seeds of all 4 hosts. Isolates from wheat, triticale and H. pusillum were fluorescent under near-UV light on unrefined media and when grown on autoclaved wheat and barley seeds placed on oxgall agar whereas most isolates from barley were nonfluorescent. Fluorescent isolates from barley were identical to isolates from wheat in cultural characters on 6 media and in pathogenicity. Isolates from wheat and barley with differing characters are considered to be biotypes of S. nodorum. Colony characters must be noted carefully during assay from barley seed on oxgall agar since most isolates are nonfluorescent.

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