HortScience (2005) 40, 39-42

Philip J. Stewart, John R. Clark and Patrick Fenn (2005)
Sources and inheritance of resistance to fire blight (Erwinia amylovora) in eastern U.S. blackberry genotypes
HortScience 40 (1), 39-42
Abstract: Resistance to fire blight in blackberry (Rubus subgenus Rubus Watson) was studied in both seedling populations and clonally propagated plants. Seedling populations resulted from a partial diallel crossing of seven cultivars (Apache, Arapaho, Chester Thornless, Illini Hardy, Navaho, Triple Crown, and Prime-Jim^TM). Clonal material evaluated included eleven cultivars (Apache, Arapaho, Chester Thornless, Chickasaw, Kiowa, Illini Hardy, Navaho, Ouachita, Shawnee, Triple Crown, and Prime-Jim) and six breeding selections. Inoculations were made by injection of suspensions of Erwinia amylovora in sterile water. Significant differences in resistance were found among genotypes; 'Navaho' was the most susceptible, and 'Kiowa' and a breeding selection A-2095, the most resistant. Seedling inoculations showed resistance to be quantitatively inherited and mostly additive, with an overall narrow-sense heritability of h² = 0.32.
(The abstract is excluded from the Creative Commons licence and has been copied with permission by the publisher.)
Database assignments for author(s): Patrick Fenn

Research topic(s) for pests/diseases/weeds:
resistance/tolerance/defence of host

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Pest and/or beneficial records:

Beneficial	Pest/Disease/Weed	Crop/Product	Country	Quarant.
	Erwinia amylovora	Raspberry/blackberry (Rubus)