Causal agent: Septoria passerinii and Stagonospora avenae f. sp. triticeae (teleomorph: Phaeosphaeria avenaria f. sp. triticeae).
Symptoms: in seedlings, S. passerinii causes faint, yellowish areas that turn greenish gray then straw colored with time forming a distinct demarcation next to healthy green tissue. On adult plants S. passerinii infection produces long, rectangular lesions delimited by veins that first appear graying then turn tan or straw colored. S. avenae f. sp. triticea produces yellow brown lesions that traverse veins and are shield or lens shaped.
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