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|Identify Soybean Rust
|How To Identify Soybean Rust
|One of the challenges of dealing with soybean rust is that the disease is hard to identify. Early symptoms appear as yellowish mosaic discoloration on the upper surfaces of older leaves. As the disease progresses, infected leaves turn yellow, and brown or reddish pustules appear, generally on the bottom surface of the leaf.
Under a 20x hand lens, the pustule can be seen to be raised, and have a pore on top, rather than a fissure. It lookslike a little volcano. Soybean rust pustules also lack the yellowish halo associated with bacterial pustule.