Rust disease first shows as yellowing of lower leaves and mostly commonly seen in mild temperature conditions. The disease can also distort the stem.

Orange and black spots can be observed on both upper and lower side of the leaves. The disease is only rarely seen in Florida. The pathogen favors milld temperatures and wet conditions.

Subsequently, the infected leaves can become severely necrotic as seen in the lower side of the leaves in this picture.

The leaves can have severe burned appearance. The pathogen can survive in leaf debris and dead stem and reinfect plants during the next season.