Puccinia coronata is a plant pathogen and causal agent of oat and barley crown rust. The pathogen occurs worldwide infecting both wild and cultivated oats.
Uredinia are linear, light orange, and occur mostly on the leaf blades but occasionally occur also on leaf sheaths, peduncles and awns. Extensive chlorosis is often associated with the uredinia. Telia are mostly linear, black to dark brown, and are covered by the host epidermis.
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