Symptoms: Soybean rust is an airborne fungal disease that causes lesions on the leaves, stem and pods, premature defoliation, fewer pods, lighter seeds and poor seed quality.
Infection is most common on the underside of the lower leaves usually during the plant flowering stage.
Lesions appear as irregularly shaped spots that develop spore-containing pustules. These lesions, usually confined to the veins or close to the veins, gradually increase in size and turn brown or reddish as the disease progresses.
Soybean rust symptoms are similar to those of other common soybean diseases such as bacterial pustule, bacterial blight or septoria brown spot.