Multiple marker analysis was used to test for the CMD2 gene in the progenitors and progenies. The presence of the CMD2 gene in the CMD resistant parental genotypes requires the presence of an allele associated with CMD2 and the co-segregation with
CMD resistance in the progeny. Four markers wereused to analyse for the CMD2 gene. The presence of alleles associated with CMD2 in the four markers in a genotype is an indication that the most probable source of CMD resistance is CMD2