ISHS Acta Horticulturae 69: II International Symposium on Pear Growing
PEAR ROOTSTOCK AND PYRUS RESEARCH IN OREGON |
| Authors: | M.N. Westwood, P.B. Lombard |
| Abstract:
Oregon's pear rootstock program was started before 1915 by F. C. Reimer, whose primary objective was to find root and framestocks resistant to fire blight. He collected blight resistant cultivars from the U.S.A. and species from China, Korea and Japan. They were used to establish extensive rootstock trials in the Rogue River Valley. With the occurrence of pear decline disease in Oregon in about 1956, new work was started to determine the relationship of rootstocks to this new disease. Beginning in 1960 a complete world-wide collection of Pyrus species was established, from which 17 000 trees were propagated for 30 test plots. These plots have been used to test species and related genera for resistance to blight, decline, root aphid, pear psylla, nematodes, and phytophthora water mold. They also were tested for graft compatibility, growth control, tolerance to wet soils, mineral nutrient uptake, chilling requirement, winter hardiness and general effects on yield efficiency. | |
Download Adobe Acrobat Reader (free software to read PDF files) | |
