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Causal organism - Puccinia triticina
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Wheat, barley, rye and grasses.
Pathotypes of both P. triticina and P. hordei (brown rust of
barley) exist.
Symptoms of brown rust infection are often seen in the autumn on early sown crops as individual orange to brown pustules. With early autumn infection individual pustules are frequently confused with yellow rust, being orange to brown and about 1 mm in diameter. Later in the season diagnosis is much easier as pustules tend to be scattered at random on leaves. Symptoms are usually seen on the leaves although in severe attacks symptoms can be seen on the stem and glumes. When leaves begin to senesce, a 'green island' develops around individual pustules. Towards the end of the season dark teliospores are sometimes produced.
