Virulence of Albugo Candida from turnip rape (Brassica campestris) and mustard (Brassica juncea) on various crucifers

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Abstract
The inoculation of seven differential hosts with sporangia of Albugo candida obtained from turnip rape (Brassica campestris) and brown mustard (Brassica juncea) showed that these isolates were races 7 and 2, respectively, according to the classification of Pound and Williams (1963). Of eleven crucifers inoculated with A. candida from B. campestris the turnip rape cultivars Torch and Candle were the most susceptible, followed in order by the B. napus cultivar Triumph, the moderately resistant B. campestris cultivar Tobin, then the Raphanus sativus cultivar Raoula and B. oleracea. The B. juncea cultivars Pusa Bold and Common Brown were equally susceptible to infection by A. candida from mustard. The two isolates from turnip rape and mustard were not cross pathogenic.

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