Submitted to: Phytopathology
Publication Type: Abstract Only
Publication Acceptance Date: June 1, 2002
Publication Date: August 20, 2002
Citation: Maas, J.L., Hartung, J.S., Gouin, C.C., Lewers, K.S., Hokanson, S.C. 2002. Resistance to bacterial angular leafspot disease, caused by xanthomonas fragariae, in strawberry. Phytopathology. Technical Abstract: Bacterial angular leafspot disease of strawberry, caused by Xanthomonas fragariae, has become an increasingly important problem for strawberry producers and nurserymen worldwide. No suitable chemical control strategies are available, nor until now have any sources of resistance to this disease been made available to breeders. We screened numerous of Fragaria genotypes against two of the four genotypic strain groups of X. fragariae and determined that clones F. virginiana SG-89 and 80-4-38, a hybrid of F. virginiana X F. x ananassa 'Earliglow', were resistant. In subsequent tests against all four genotypic strain groups, these strawberry clones were highly resistant. The resistance exhibited was not of the hypersensitive host reaction type. Crosses were made between these clones and a susceptible parent, 'Sweet Charlie', and the progeny screened against all four genotypic strains. Transmission of resistance to progenies varied from 4-18 percent, depending on the challenge strain used. Resistance apparently involves two recessive genes, according to Chi2 analyses of data.