Abstract
Halo blight, caused by a bacterium, Pseudomonas syringae pv. phaseolicola (Psp), is one of the most important bacterial diseases of common beans (Phaseolus vulgaris L.). The objective of this study was to evaluate the pathogenic variation of Psp strains with emphasis on those collected in Nebraska. Twenty-nine Psp strains were inoculated on 20-day-old leaves of eight differential cultivars/lines and a resistant check line great northern (GN) Nebraska #1 sel. 27. Two experiments were conducted in growth chambers under 20 °C and 12-h photoperiod. A split-plot design was used with nine cultivars/lines as whole plots in a randomized complete block design (RCBD) and strains as sub-plots in an incomplete block arrangement. Data were analyzed as a split-plot with a RCB arrangement because incomplete block was not significant. Strains were classified into five races with six, 16, and two strains classified as races 1, 6, and 7, respectively. The remaining strains were designated tentatively as new races 10 and 11. GN Nebraska #1 sel. 27 was resistant to all Psp strains tested. This information is useful to breeders interested in developing germplasm and cultivars resistant to Psp.
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