Common Bean Rust
June 19, 2006
Common bean rust, caused by the fungus Uromyces appendiculatus, can be a problem on susceptible varieties if conditions are right. Because new races can be introduced or can evolve that might be able to overcome these resistant genes, it is a good idea to keep an eye out for rust even in fields planted to resistant varieties. Many resistant varieties are available in common market classes such as pinto and navy, however, few to none of the varieties in special market classes such as small red and pink are resistant.
A fungicide may be needed to control common bean rust on susceptible varieties. All fungicides registered for rust control on dry bean should be applied prior to onset of disease for maximum efficacy. Products registered for rust control include Amistar, Quadris, Quadris Opti, Headline, chlorothalonil products (Bravo, Echo, etc.), and maneb products (Maneb, Manex).