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Tamires Ribeiro, Cleber Vinicius Giaretta Azevedo, Jose Antonio de Fatima Esteves, Sérgio Augusto Morais Carbonell, Margarida Fumiko Ito and Alisson Fernando Chiorato

Abstract: The aim of this study was to evaluate the resistance of 58 common
bean lines against common bacterial blight (Xanthomonas axonopodis pv.
phaseoli) and bacterial wilt (Curtobacterium flaccumfaciens pv. flaccumfaciens).
The experimental design consisted of completely randomized blocks, with four
replications per pathogen. The results were subjected to variance analysis by the
F test at 1% probability. Significant differences between the treatments indicated
different resistance levels among the lines against both pathogens. According
to the Scott-Knott test, six lines were resistant to Xanthomonas axonopodis pv.
phaseoli, 14 moderately resistant, and 38 susceptible. To Curtobacterium flaccumfaciens
pv. flaccumfaciens, 11 lines were resistant, 26 moderately resistant
and 21 susceptible. Among these, the lines Pr10-3-4/1, Pr10-5-2/1 and Pr10-5-
2/2 of the black bean group and C10-2-4/2 of the Carioca group were resistant
to both major bacterial diseases affecting common bean in Brazil.

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