REACTION OF COMMON BEAN CULTIVARS AND LINES TO BACTERIAL BROWN SPOT IN SOUTH AFRICA

摘要

Bacterial brown spot (BBS) caused by Pseudomonas syringae pv. syringae is a seed-borne disease of dry beans (Phaseolus vulgaris L.) and results in serious yield and seed quality losses worldwide including South Africa (Franc, 1998; Jung et al, 2003).Planting of pathogen-free seed is the most important control method, however, it does not guarantee disease control. Copper based bacteriacides protect foliage against infection and secondary pathogen spread, but control is limited and resultant yield increases are minimal (Garrett and Schwartz, 1998). Plant genetic resistance is considered the most economically effective and environmentally friendly control measure (Jung et al, 2003; Petzoldt, 2007). The objective of this study was to evaluate bean genotypes for resistance to BBS, which could direct breeding strategies towards resistance against this disease in South Africa.