Images

Pustules (pimple-like structures) found underside of the leaf.

Lesions on underside of leaf

Yellow areas appear translucent

Spores of Phakopsora pachyrhiza

Spores of Phakopsora pachyrhiza

Soybean rust is caused by the fungus Phakopsora pachyrhizi. The fungus produces oval, spiny spores which are distributed by wind.

Rust pustules bursting with spores

Rust pustules bursting with spores

When rust pustules are mature, they burst and release masses of spores into the air.

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