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Bacterial Disease Alert:


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Bean Rust Alert:


Bean Rust Life Cycle:

Pycnia (yellow to tan spots) develop on the leaves as a result of infection from overwintering teliospores (black rust) that resulted from rust infected bean plants during the latter part of the previous growing season. When pycnia are fertilized by spores from other compatible pycnia, snowy white aecial horns will develop on the lower surface of the leaf below the pycnia. Spores released from the white aecial horns can then infect new dry bean leaves, erupting in the (reddish-orange) uredinial dry bean rust that can travel long distances and infect other bean fields. This uredinial rust stage can infect new plants, and release new spores in repeating cycles several times during the growing season. At the end of the growing season, as bean plants begin to change color, rust infected plants begin producing teliospores, which can overwinter in bean debris, and initiate the cycle again the following spring.