REACTION OF ONTARIO DRY BEANS TO ASIAN SOYBEAN RUST (PHAKOPSORA PACHYRHIZI) IN PRELIMINARY TRIALS IN SOUTH AFRICA

摘要

Soybean rust caused by Phakopsora pachyrhizi is a new disease spreading from Asia through the Middle East, Zimbabwe, South Africa, across Atlantic Ocean to Brazil and Colombia, and it was found in the southeastern U.S. in November 2004. It has since been found as far north as Indiana in 2006. Although it will not overwinter in Canada, it may occasionally reach Canada by air currents similar to the patterns of common bean rust (Uromyces appendiculatus) and wheat rust (Puccinia sp). Therefore, we conducted a preliminary testing of Canadian dry bean cultivars in South Africa for their reaction to this new rust. Field and greenhouse trials were carried out during 2005-2007 with 13 dry bean cultivars/line developed in Ontario, Canada [5 navy beans (n), 3 kidney beans (rk), 2 pinto beans (p), 2 black beans (b) and a cranberry line (cr)] to examine their reaction to soybean rust.