 Rust
Puccinia and uromyces sp.
Small yellow, orange or red raised blisters on leaves and stems
Powdery orange spores brush off infected leaves and can be seen on a white tissue
Leaf tissue around the rust spots turns yellow and sometimes brown
In severe cases rust spots may merge together to form large yellow or orange streaks or blotches
Severely infected leaves may turn brown, dry up and die
Rust spots become dark brown or black late summer and early fall
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