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Fruit Varieties Journal
(Fruit Var J)

American Pomological Society

Volume 42 Number 3 Article 9 Pages: 109-115
Year 1988 Month 7
Title: Virus Tested Pear Germplasm Available at the National Clonal Germplasm Repository in Corvallis, Oregon
Authors: J. Postman, and K. Hummer
More than 1800 unique pear accessions are maintained at the National Clonal Germplasm Repository (NCGR) in Corvallis, Oregon. The 23 primary wild species of Pyrus and over 1400 unique cultivars, rootstocks, and selections are represented in this collection. Sixty-one percent of pear cultivars were found to be infected with common pear viruses. The repository has 575 pear clones that have tested virus-negative as received. Known viruses have been eliminated from 288 pear clones by subjecting them to thermotherapy and micropropagation. These clones are now available to researchers and plant breeders. Most have previously been unavail able in North America as virus-tested plants.

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