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The OHxF series of rootstocks originated from crosses made more than 75 years ago by Reimer at Oregon State. Reimer was seeking primarily rootstocks resistant to fire blight; both the Old Home and Farmingdale parents are highly resistant. Reimer's work was continued by nurseryman Lyle Brooks and by researchers at Oregon State. All the OHxFs are propagated by cuttings or in tissue culture -- with considerable difficulty, as all are reluctant rooters.
OHxF 333 A semi-dwarfing pear rootstock. It is 1/2 to 2/3 standard size. Its resistance to fireblight, collar rot, woolly pear aphids and pear decline make this a very healthy stock. Precocious, well-anchored. Trees are very productive. Some reports that fruit size is reduced
OHxF 40 A semi-vigorous pear rootstock, about 2/3 standard size. Resistant to fire blight, crown rot, woolly pear aphids, and pear decline. Precocious, well-anchored. Patented; royalty 50¢
OHxF 87 A semi-vigorous pear rootstock, about 2/3 standard size. Resistant to fire blight, crown rot, woolly pear aphids, and pear decline. Precocious, well-anchored. Patented; royalty 50¢.
OHxF 97 A vigorous pear rootstock. Standard size, but more precocious and productive than seedling stocks. Appears to be especially valuable for Asian pears.
DWARFING PEAR ROOTSTOCKS For many years, pears have been grafted onto quince rootstocks to obtain dwarf trees analagous to apple trees dwarfed on Malling 9. Most varieties of pears are more or less incompatible on most quince clones (but in several instances, including Bartlett on Quince A, expression of incompatibility may often be delayed until 8 or 10 years or more in the orchard). All the quince stocks we have tested have been quite susceptible to fire blight and most are somewhat winter-tender. Even so, there are many outstanding plantings of dwarf pears in commercial production.
SEEDLING The industry standard. Pear seedlings are still quite satisfactory if proper care is given. Pyrus betulifolia ("BET") seedlings are the rootstocks of choice for Asian pears. A number of extensive field trials have shown that fruit size is increased significantly as compared to other rootstocks. We also use Winter Nelis seedlings -- somewhat more winter-hardy than BET.