ISHS Acta Horticulturae 489: VIII International Workshop on Fire Blight
EVALUATION OF THE CORE SUBSET OF THE USDA APPLE GERMPLASM COLLECTION FOR RESISTANCE TO FIRE BLIGHT |
| Authors: | H.S. Aldwinckle, H.L. Gustafson, P.L. Forsline |
| Keywords: | Erwinia amylovora, Malus |
| Abstract:
The core subset of the U.S. national apple collection, consisting of 69 cultivars of Malus X domestica, and 139 clones of 47 Malus species, subspecies, and hybrids was evaluated for resistance by inoculation with a Maloideae strain of Erwinia amylovora. A diversity in reaction was observed in cultivars, species and hybrids. Most cultivars were relatively susceptible, although several had useful levels of resistance. Only one to four genotypes of each species were inoculated, but resistance was observed in several, indicating that useful resistances occur in diverse Malus species. Many core subset members were also inoculated with an Hokkaido strain of E. amylovora, and susceptibility was observed in M. TX domestica cv. Florina and M. doumeri (=formosana). | |
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