| 0 | PI 638018 | Du Li | Pyrus betulifolia Bunge | Shaanxi Sheng, China | COR |  | | 2004 | COLLECTED | 02/2004 | From the mountains of northwest Shaanxi in the wild pear forests of Huang Ling. | 35.58334000, 109.25000000 | 0 | | Cultivated material | Collected in the wild pear forests of Huang Ling in Shaanxi Province, China. John Wells traveled to Shaanxi Province in February, 2004 and was given this seed by Mr. Xu Pu Gang at Xia-Ja Gou Village in Yangling County, the grower at Northwest Sci-Tech University of Agriculture and Forestry, Yangling Demonstration Farm. This is a cold-hardy form of P. betulifolia, from the northern limit of the natural range of this species. It is used as a rootstock for Asian pears and European pears in this part of China. Mr. Xu purchases the whole fruit with stem, and cleans and dries the seed in October, November and December. In January, approximately 50-60 days before soil temperatures increase, these dried seeds are placed in sand stratification. In early March the seeds are planted at the density of 15 x 30 cm, at the rate of two kilograms of seed per one Mu (1/6 acre). As many as 20,000 seedling/Mu are produced but only the best, about 10,000/Mu are budded in September. It is said to produce a dwarf tree that is drought and waterlog resistant, and is of much interest to the pear industry of the pacific northwest United States as a potential dwarfing rootstock for cultivated pears. -- information from John Wells, 2 March, 2004. This seedlot was collected from the same general region as PI 541007, received in 1989. | 1656327 | PI 638018 |
| 1 | PI 541007 | Du Li | Pyrus betulifolia Bunge | Shaanxi Sheng, China | COR |  | | 1989 | COLLECTED | | Shanxi Province | 38.00000000, 106.00000000 | 2000 | | Wild material | Ma Shu Shang's (Northwestern University in Xion) description: 'The wild trees scattered in the mountains in northern Shaanxi (including Huang Ling County). The fruits are picked and the seeds collected by local farmers, who sale the dried seeds to the nurseryman.' -- email from John Wells, Hood River Grower Shipper Association, 11/2003. Survives -35 F in Alberta, Canada Pyrus betulifolia (Du Li) native to Shanxi Province forest/mountain region. This material was collected about 38 degrees N latitude and 106 degrees east longitude in mountainous regions that drop to 40 degrees celsius in winter. elevation 2000 meters(?). Received 3.6 oz of seed (about 3600 seed). Information sheet 116 | 1435943 | PI 541007 |
| 2 | PI 541004 | OSU-3 seedling 4 | Pyrus betulifolia Bunge | Oregon, United States | COR | | | 1988 | DEVELOPED | | | | | | Breeding material | Medium fruit. Parent tree was selected by Reimer | 1435940 | PI 541004 |
| 3 | PI 540965 | OSU-3 seedling | Pyrus betulifolia Bunge | Oregon, United States | COR |  | | 1983 | DEVELOPED | | | | | | Breeding material | Aphid resistant | 1435901 | PI 540965 |
| 4 | PI 540966 | OSU-1 seedling A | Pyrus betulifolia Bunge | Oregon, United States | COR |  | | 1983 | DEVELOPED | | | | | | Breeding material | | 1435902 | PI 540966 |
| 5 | PI 540969 | OSU-3 | Pyrus betulifolia Bunge | Oregon, United States | COR |  | | 1983 | DEVELOPED | | | | | | Breeding material | | 1435905 | PI 540969 |
| 6 | PI 540971 | P. betulifolia - Italy | Pyrus betulifolia Bunge | China | COR |  | | 1983 | DEVELOPED | | | | | | Breeding material | | 1435907 | PI 540971 |
| 7 | PI 540972 | P. betulifolia - Italy | Pyrus betulifolia Bunge | China | COR |  | | 1983 | COLLECTED | | | | | | Breeding material | | 1435908 | PI 540972 |
| 8 | PI 540974 | P. betulifolia - Culbertson | Pyrus betulifolia Bunge | | COR |  | | 1983 | | | | | | | Breeding material | May be hardier than betulifolia from south China | 1435910 | PI 540974 |
| 9 | PI 540975 | P. betulifolia - Culbertson | Pyrus betulifolia Bunge | Oregon, United States | COR |  | | 1983 | DEVELOPED | | | | | | Breeding material | Not tested for blight resistance, white pubescence on tips | 1435911 | PI 540975 |
| 10 | PI 540976 | P. betulifolia - Culbertson | Pyrus betulifolia Bunge | Oregon, United States | COR |  | | 1983 | DEVELOPED | | | | | | Breeding material | Not tested for blight res., white pubescence on branch tips | 1435912 | PI 540976 |
| 11 | PI 540977 | P. betulifolia - Culbertson | Pyrus betulifolia Bunge | Oregon, United States | COR |  | | 1983 | DEVELOPED | | | | | | Breeding material | Not tested for blight res., white pubescence on branch tips | 1435913 | PI 540977 |
| 12 | PI 540979 | P. betulifolia - Culbertson | Pyrus betulifolia Bunge | Oregon, United States | COR |  | | 1983 | DEVELOPED | | | | | | Breeding material | Not tested for blight res., white pubescence on branch tips | 1435915 | PI 540979 |
| 13 | PI 540980 | OSU-2 x OSU-1 | Pyrus betulifolia Bunge | Oregon, United States | COR |  | | 1983 | DEVELOPED | | | | | | Breeding material | | 1435916 | PI 540980 |
| 14 | PI 540981 | 'OPR 259' | Pyrus betulifolia Bunge | Oregon, United States | COR | | | 1983 | DEVELOPED | | | | | | Breeding material | OPR (Oregon Pear Rootstock) No. 259 is a seedling of P. betulifolia Talent No. 3; Crown gall resistant clone No. 1 selected by M.N. Westwood. | 1435917 | PI 540981 |
| 15 | PI 540982 | 'OPR 260' | Pyrus betulifolia Bunge | Oregon, United States | COR | | | 1983 | DEVELOPED | | | | | | Breeding material | OPR (Oregon Pear Rootstock) No. 260 is a seedling of P. betulifolia Talent No. 3; Crown gall resistant clone No. 2 selected by M.N. Westwood. | 1435918 | PI 540982 |
| 16 | PI 540983 | 'OPR 261' | Pyrus betulifolia Bunge | Oregon, United States | COR | | | 1983 | DEVELOPED | | | | | | Breeding material | OPR (Oregon Pear Rootstock) No. 261 is a seedling of P. betulifolia Talent No. 3; Crown gall resistant clone No. 3 selected by M.N. Westwood. | 1435919 | PI 540983 |
| 17 | PI 540984 | 'OPR 262' | Pyrus betulifolia Bunge | Oregon, United States | COR | | | 1983 | DEVELOPED | | | | | | Breeding material | OPR (Oregon Pear Rootstock) No. 262 is a seedling of P. betulifolia Talent No. 3; Crown gall resistant clone No. 4 selected by M.N. Westwood. | 1435920 | PI 540984 |
| 18 | PI 540985 | 'OPR 263' | Pyrus betulifolia Bunge | Oregon, United States | COR | | | 1983 | DEVELOPED | | | | | | Breeding material | OPR (Oregon Pear Rootstock) No. 263 is a seedling of P. betulifolia Talent No. 3; Crown gall resistant clone No. 5 selected by M.N. Westwood. | 1435921 | PI 540985 |
| 19 | PI 540986 | 'OPR 264' | Pyrus betulifolia Bunge | Oregon, United States | COR |  | | 1983 | DEVELOPED | | | | | | Breeding material | OPR (Oregon Pear Rootstock) No. 264 is a seedling of P. betulifolia Talent No. 3; Crown gall resistant clone No. 6 selected by M.N. Westwood. | 1435922 | PI 540986 |
| 20 | PI 540987 | 'OPR 265' | Pyrus betulifolia Bunge | Oregon, United States | COR |  | | 1983 | DEVELOPED | | | | | | Breeding material | OPR (Oregon Pear Rootstock) No. 265 is a seedling of P. betulifolia Talent No. 3; Crown gall resistant Clone No. 7 selected by M.N. Westwood. | 1435923 | PI 540987 |
| 21 | PI 540988 | 'OPR 266' | Pyrus betulifolia Bunge | Oregon, United States | COR | | | 1983 | DEVELOPED | | | | | | Breeding material | OPR (Oregon Pear Rootstock) No. 266 is a seedling of P. betulifolia Talent No. 3; Crown gall resistant Clone No. 8 selected by M.N. Westwood. | 1435924 | PI 540988 |
| 22 | PI 540989 | OSU-3 seedling B | Pyrus betulifolia Bunge | Oregon, United States | COR |  | | 1983 | DEVELOPED | | | | | | Breeding material | Aphid resistant | 1435925 | PI 540989 |
| 23 | PI 540990 | OSU-3 seedling C | Pyrus betulifolia Bunge | Oregon, United States | COR |  | | 1983 | DEVELOPED | | | | | | Breeding material | Aphid resistant | 1435926 | PI 540990 |
| 24 | PI 540991 | OSU-3 seedling | Pyrus betulifolia Bunge | Oregon, United States | COR |  | | 1983 | DEVELOPED | | | | | | Breeding material | Aphid resistant | 1435927 | PI 540991 |
| 25 | PI 540992 | OSU-1 | Pyrus betulifolia Bunge | Oregon, United States | COR |  | | 1983 | DEVELOPED | | | | | | Breeding material | | 1435928 | PI 540992 |
| 26 | PI 540994 | OSU- 2 x OSU-1 | Pyrus betulifolia Bunge | Oregon, United States | COR |  | | 1983 | DEVELOPED | | | | | | Breeding material | Blight resistant | 1435930 | PI 540994 |
| 27 | PI 617510 | P. betulifolia OSU selection | Pyrus betulifolia Bunge | China | COR |  | | 1983 | COLLECTED | | | | | | Breeding material | | 1010041 | PI 617510 |
| 28 | PI 540949 | P. betulifolia 29-20 No. 3 | Pyrus betulifolia Bunge | Oregon, United States | COR |  | | 1982 | DEVELOPED | | | | | | Breeding material | | 1435885 | PI 540949 |
| 29 | PI 540948 | IRP 139-1 | Pyrus betulifolia Bunge | Oregon, United States | COR |  | | 1981 | DEVELOPED | | | | | | Breeding material | Original seedlot collected by Reimer in 1918 | 1435884 | PI 540948 |
| 30 | PI 322707 | P. betulifolia - Ukraine | Pyrus betulifolia Bunge | Ukraine | COR |  | | 1981 | COLLECTED | 09/14/1967 | | | | | Cultivated material | Budsticks collected by Howard J. Brooks, agricultural explorer for the USDA Plant Industry Station, Crops Research Division, Beltsville, Maryland. Collected in the USSR and received in Beltsville on 14 September, 1967. Collector number B-35: Pyrus betulaefolia from botanical garden at Askaniya-Nova, Ukraine. Fruit with no grit. -- USDA Plant Inventory No. 175. No grit in the fruit | 1239935 | PI 322707 |
| 31 | PI 540942 | P. betulifolia 8-5 | Pyrus betulifolia Bunge | Oregon, United States | COR |  | | 1981 | DEVELOPED | | | | | | Breeding material | Description: Pyrus betulifolia was introduced at the Arnold Arboretum in 1882 from the mountains near Peking. The pears have no value as a source of food but the trees proved to be promising. Although Reimer of Oregon has reported that this species is susceptible to fire blight in Oregon, this has not been the case at the Arnold Arboretum nor anywhere else in the East. In addition, the seedlings have been reported to be free of leaf-blight. The young plants can grow vigorously from seeds or cuttings and can bud throughout the long season. They are also compatible with many other pears in China. And, because this species is widely distributed in China it is possible to obtain seeds that would give rise to trees that do not deviate from the parents. | 1435878 | PI 540942 |
| 32 | PI 540943 | 'OPR 110' | Pyrus betulifolia Bunge | Oregon, United States | COR |  | | 1981 | DEVELOPED | | | | | | Breeding material | OPR (Oregon Pear Rootstock) No. 110 is Talent fire blight resistant P. betulifolia clone # 1. Originated from seed that F. Reimer collected in China. -- from M.W. Westwood rootstock inventory 11/17/1961 | 1435879 | PI 540943 |
| 33 | PI 540944 | 'OPR 111' | Pyrus betulifolia Bunge | Oregon, United States | COR |  | | 1981 | DEVELOPED | | | | | | Breeding material | OPR (Oregon Pear Rootstock) No. 111 is Talent P. betulifolia clone # 2. Originated from seed that F. Reimer collected in China. Fire blight resistant. -- from M.W. Westwood rootstock inventory 11/17/1961 | 1435880 | PI 540944 |
| 34 | PI 540946 | 'OPR 114' | Pyrus betulifolia Bunge | Oregon, United States | COR |  | | 1981 | DEVELOPED | | | | | | Breeding material | OPR (Oregon Pear Rootstock) No. 114 is Talent fire blight susceptible P. betulifolia clone # 5. Originated from seed that F. Reimer collected in China. -- from M.W. Westwood rootstock inventory 11/17/1961 | 1435882 | PI 540946 |
| 35 | PI 541737 | B-37552 | Pyrus hybr. | Uncertain | COR |  | | 1983 | COLLECTED | 10/03/1966 | Talent, Southern Oregon | | | | Wild material | This seedlot, received from M. Westwood in 1983, carries the same B number (B-37552) as PI 541718 which was wild collected in China. This seedlot is presumed to be open pollinated seed collected in Oregon, from a seedling or seedlings of the original seedlot. Ten seedlings of PI 541737 were grown from this seed accession in 2004. The young seedlings are variable, some with lobed juvenile leaves typical of P. betulifolia, others with non-lobed juvenile leaves. Five seedlings were selected on 6/20/2005 to be planted in the field to perpetuate this accession. These seedlings could be back-crossed to PYR 648.001 (clone of PI 541718) which is presumably their parent if it is desired to concentrate the genes from the original accession. Five seedlings from this same seedlot were grown out in 1989 at NCGR and later discarded because they were not P. betulifolia. - jp 6-20-2005 | 1436673 | PI 541737 |
| 36 | PI 541738 | P. fauriei x P. betulifolia-1 | Pyrus hybr. | Oregon, United States | COR | | | 1983 | DEVELOPED | | | | | | Breeding material | Rootstock clone | 1436674 | PI 541738 |
| 37 | PI 541739 | P. fauriei x P. betulifolia-1 | Pyrus hybr. | Oregon, United States | COR | | | 1983 | DEVELOPED | | | | | | Breeding material | Rootstock clone | 1436675 | PI 541739 |
| 38 | PI 541769 | P. pashia x P. betulifolia | Pyrus hybr. | Oregon, United States | COR | | | 1983 | DEVELOPED | | | | | | Breeding material | | 1436705 | PI 541769 |
| 39 | PI 541770 | P. betulifolia x P. calleryana | Pyrus hybr. | Oregon, United States | COR | | | 1983 | DEVELOPED | | | | | | Breeding material | Possibly a good rootstock clone | 1436706 | PI 541770 |
| 40 | PI 541771 | P. betulifolia-2 x P. calleryana-2 | Pyrus hybr. | Oregon, United States | COR | | | 1983 | DEVELOPED | | | | | | Breeding material | Possibly a very good rootstock clone | 1436707 | PI 541771 |
| 41 | PI 541775 | P. betulifolia x P. pyrifolia | Pyrus hybr. | Oregon, United States | COR |  | | 1983 | DEVELOPED | | | | | | Breeding material | | 1436711 | PI 541775 |
| 42 | PI 541780 | P-79 x P. betulifolia | Pyrus hybr. | Oregon, United States | COR |  | | 1983 | DEVELOPED | | | | | | Breeding material | Blight-resistant rootstock | 1436716 | PI 541780 |
| 43 | PI 541783 | P. betulifolia x P. calleryana-5 | Pyrus hybr. | Oregon, United States | COR | | | 1983 | DEVELOPED | | | | | | Breeding material | Possibly a very good rootstock clone, blight resistant | 1436719 | PI 541783 |
| 44 | PI 541784 | P. betulifolia-2 x P-12 | Pyrus hybr. | Oregon, United States | COR | | | 1983 | DEVELOPED | | | | | | Breeding material | Possibly a very good rootstock clone, blight resistant | 1436720 | PI 541784 |
| 45 | PI 541785 | P. betulifolia-2 x Farmingdale | Pyrus hybr. | Oregon, United States | COR |  | | 1983 | DEVELOPED | | | | | | Breeding material | Possibly a very good rootstock clone, blight resistant | 1436721 | PI 541785 |
| 46 | PI 541786 | Burkett x P. betulifolia | Pyrus hybr. | Oregon, United States | COR |  | | 1983 | DEVELOPED | | | | | | Breeding material | Possibly a very good hybrid rootstock clone, blight resist. | 1436722 | PI 541786 |
| 47 | PI 541787 | Old Home x P. betulifolia-1 | Pyrus hybr. | Oregon, United States | COR |  | | 1983 | DEVELOPED | | | | | | Breeding material | Blight resistant | 1436723 | PI 541787 |
| 48 | PI 541788 | Old Home x P. betulifolia-1 | Pyrus hybr. | Oregon, United States | COR |  | | 1983 | DEVELOPED | | | | | | Breeding material | Blight resistant rootstock | 1436724 | PI 541788 |
| 49 | PI 541790 | P. betulifolia-1 x P-12 | Pyrus hybr. | Oregon, United States | COR |  | | 1983 | DEVELOPED | | | | | | Breeding material | Blight resistant, possibly a very good rootstock clone | 1436726 | PI 541790 |
| 50 | PI 541791 | P. betulifolia-1 x P-79 | Pyrus hybr. | Oregon, United States | COR |  | | 1983 | DEVELOPED | | | | | | Breeding material | Blight resistant, possibly a very good rootstock clone | 1436727 | PI 541791 |
| 51 | PI 541798 | P. betulifolia x P. pyrifolia | Pyrus hybr. | Oregon, United States | COR |  | | 1983 | DEVELOPED | | | | | | Breeding material | | 1436734 | PI 541798 |
| 52 | PI 541800 | Nelis x P. betulifolia | Pyrus hybr. | Oregon, United States | COR |  | | 1983 | DEVELOPED | | | | | | Breeding material | Possibly a very good rootstock clone, pear decline resistant | 1436736 | PI 541800 |
| 53 | PI 617526 | P. betulifolia 2 x P. calleryana 2 | Pyrus hybr. | Oregon, United States | COR | | | 1983 | DEVELOPED | | | | | | Breeding material | Possibly a good rootstock clone | 1014214 | PI 617526 |
| 54 | PI 541718 | P. betulifolia hybrid | Pyrus hybr. | China | COR | | | 1981 | COLLECTED | | | | | | Wild material | Documentation indicates that seed was wild collected in China. Received at NCGR-Corvallis as scions and propagated as a single clone. - J. Postman 6/2005 | 1436654 | PI 541718 |