Albugo Candida white blister or white rust Fig
Control can be achieved by preventative and eradicant fungicidal sprays against foliar and systemic infections. Race-specific resistance governed by single dominant genes has been identified in several Brassica and Raphanus spp.; quantitative inheritance of disease reaction type was demonstrated in B. rapa.
Resistance to race 2 of A. candida is controlled by a single dominant gene, and resistance was associated with leaf pubescence, which is also governed by a single dominant allele (Kole et al., 1996). The resistance locus ACA1 and pubescence locus PUB1 were mapped using restriction fragment length polymorphisms (RFLPs) to linkage group 4. Portuguese land races of B. oleracea were screened for white rust resistance, and 'Couve Agarvia', 'Couve Gloria de Portugal' and 'Couve Portuguesa' were the most resistant (Santos et al., 1996). Some cultivars of B. carinata have resistance to both A. candida and P. parasitica, while dominant resistance is present in B. juncea and in B. napus. Resistance to A. candida is present in interspecific crosses between B. carinata and B. juncea. Mass selection and selection between and within half-sib families were effective methods of accumulating minor genes conferring reduced pathogen sporulation in rapid cycling populations of B. rapa (Edwards and Williams, 1987). Similar genes have been identified and mapped by Kole et al. (2002) in A. thaliana.
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