Bean rust—Uromyces phaseoli
Plants infected with rust have dry reddish, yellowish, or orange spore masses or pustules primarily on
the lower surface of leaves. Bean pods may also show symptoms.
Space plants to allow for adequate air circulation. Avoid overhead sprinklers, as rust spores are spread
by wind and splashing water. Dispose of infected leaves and shoots as soon as they appear. Fungicides,
such as sulfur, applied in the spring can reduce some rust diseases. Some varieties may show resistance.
on bean leaf