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Glume Blotch Complex


© Kansas State University, Department of Plant Pathology

Pathogen(s) causing disease:

Septoria tritici and Stagonospora nodorum

Symptoms:

The initial symptoms are small brown spots on the glumes (outer chaff), lemmas (inner chaff) and awns. The spots are most common at the tips of the chaff parts. Spots expand and later may turn light tan or gray in the center. Lesions usually contain small, round, brown or black speckles that may be difficult to see. As lesions expand and grow together, the whole head may become dark brown. Lesions on the awns may give a brown and green banding symptom which is fairly characteristic.

Conditions:

 S. tritici is favored by cool, wet weather. On the other hand, S. nodorum prefers warm, wet weather. The spores are exuded in sticky masses and require hard rains to splash them up to the upper leaves and heads.

Management:

Pathogen-free seed, fungicide seed treatment, resistant cultivars, crop rotation, foliar fungicides. Destruction of infested straw, stubble, and volunteer wheat.

Sources:

Kansas State University
Purdue University

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