Images
Pustules (pimple-like structures) found underside of the leaf.
Lesions on underside of leaf
Yellow areas appear translucent
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
When rust pustules are mature, they burst and release masses of spores into the air.
