Revised

Photos of the disease stages

Soybean rust, especially in early stages, can be difficult to identify. Examine both upper and lower leaf surfaces, starting with leaves in the lower canopy of the plants.

Early stage of development of soybean rust: upper leaf surfaceFigure 2
Early stage of development of soybean rust: upper and lower leaf surfaces and canopy.

Early stage of development of soybean rust: lower leaf surface
Early stage of development of soybean rust: canopy
 

Middle stage of development of soybean rust: upper leaf surfaceFigure 3
Middle stage of development of soybean rust: upper and lower leaf surfaces and canopy.

Middle stage of development of soybean rust:  lower leaf surface
Middle stage of development of soybean rust: canopy
 

Late stage of development of soybean rust: upper leaf surfaceFigure 4
Late stage of development of soybean rust: upper and lower leaf surfaces and canopy.

Late stage of development of soybean rust: lower leaf surface
Late stage of development of soybean rust: canopy