EVALUATION OF COMMON BEAN CULTIVARS FROM THE UNITED STATES FOR THEIR REACTION TO SOYBEAN RUST UNDER FIELD CONDITIONS IN BRAZIL AND SOUTH AFRICA

摘要

The host range of the soybean rust pathogen (Phakopsora pachyrhizi) is broad with at least 95 leguminous species, including dry and snap beans (Phaseolus vulgaris). This pathogen was initially reported in the Americas infecting mostly soybean (Glycinemax) but also kudzu (Pueraria spp.). However, recently P. pachyrhizi has been reported infecting dry beans in South Africa, the U.S., Argentina, and Brazil. However, little is known about the capacity of P. pachyrhizi to infect and cause damage to mostcommon bean cultivars under field conditions. There is speculation about the possible negative effect that soybean rust may have on common bean, especially where dry bean and soybean are planted in adjacent fields, as it occurs in the U.S., Canada, Brazil, Argentina, South Africa and other countries. We report here the reaction of common bean cultivars belonging to important commercial classes in the U.S. and Canada, to a natural infection of the soybean rust pathogen under field conditions of Brazil and South Africa.