ISHS Acta Horticulturae 484: Eucarpia Symposium on Fruit Breeding and Genetics
BREEDING FOR HOST RESISTANCE TO PEAR PSYLLA: EVALUATION OF PARENTAL GERMPLASM |
| Authors: | R. L. Bell, T. Zwet |
| Keywords: | Pyrus, Cacopsylla pyricola, Fabraea leaf spot, fire blight, Fabraea maculata, Erwinia amylovora, fruit quality |
| Abstract:
The pear psylla (Cacopsylla pyricola Foerster) is one of the most destructive arthropod pests of pear (Pyrus communis L.) in North America and Western Europe. Host resistance to this pest has been identified in several species of Asian pear, including P. ussuriensis Maxim., in P. ussuriensis × P. communis hybrids, and in P. communis germplasm of Central European origin. Choice of parents for breeding also depends upon pomological traits and disease resistance. No single genotype combines acceptable levels of fruit quality and resistance traits. For example, many hybrids derived from P. ussuriensis #65 are also resistant to fire blight (Erwinia amylovora [Burr.] Winsl. et al.), but are highly susceptible to Fabraea leaf spot (Fabraea maculata Atk.). Fruit quality of many of the P. communis sources of resistance is poor. | |
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