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.
23 primary wild species of Pyrus and over 1400
unique cultivars, rootstocks, and selections are
represented in this collection.
of pear cultivars were found to be infected with
common pear viruses.
The repository has 575
pear clones that have tested virus-negative as
Known viruses have been eliminated
from 288 pear clones by subjecting them to
thermotherapy and micropropagation.
clones are now available to researchers and plant
Most have previously been unavail
able in North America as virus-tested plants.
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