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Title:   Author  item
                                            Maas, Johnitem
                                            Hartung, Johnitem
                                            Lewers, Kimberlyitem
                                            HOKANSON, STAN - UNIV OF MINNESOTA
  Submitted to: Phytopathology
                                    Publication Type: Abstract Only
                                    Publication Acceptance Date: 6/1/2002
                                    Publication  Date: 8/20/2002
                                    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.Interpretive Summary:
                                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.


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