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Fruit Varieties and Horticultural Digest
(J Fruit Var & Hort Digest)

American Pomological Society

Volume 25 Number 4 Article 7 Pages: 87-89
Year 1971 Month 10
Title: Pyrus Species and Pear Cultivar Germ Plasm Collection in Oregon
Authors: M.N. Westwood, M.N. Thompson and P.B. Lombard
A previous report (7) emphasized that "single-clone specimen" Pyrus collections in arboretums and botanic gardens were generally unsuitable materials for use in agriculture. The genus consists of about 22 species, all of which are self-sterile, and thus require more than one clone of a species to obtain seedling populations for testing which are not inter-specific hybrids. Natural hybridization occurs readily in this genus, so that controlled crosses are needed for any plants used in research. During the past 10 years, we have collected seeds from wild Pyrus throughout the world, and have established populations of each primary species at Corvallis (Table 1). Studies on rootstock potential, pest resistance and inheritance characteristics are underway (1, 2, 6, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17). Materials were also made available to others for a number of different studies (3, 4, 5, in Table 2).
Besides the primary species collection, we have a collection at Medford of cultivars which includes 187 varieties of P. communis, 6 of P. pyrifolia, 17 of P. ussuriensis and about 20 hybrids of these species. Many of these show various degrees of resistance to fire blight.

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