Manual of Rootstocks

Rootstock comparison table

Rootstock Ottawa 3A
Summary Ottawa 3A as compared to ‘O.3’; shows increased precocity, higher cumulative yield efficiency, and wider branch angles.
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Using


Ottawa 3A
Species compatibility Apple
Vigour % of standard 30% - 40%
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Growing


Ottawa 3A
Rootstock size class Dwarf
Precocity Precocious
Support required Permanent support
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Climate


Ottawa 3A
Cold-hardiness Cold-hardy
Cold hardiness (USDA) Zone 4 (-34C)
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Identification


Ottawa 3A
Country of origin Canada
Period of origin 1950 - 1999
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Problems


Ottawa 3A
Virus tolerance Very susceptible
Woolly aphid Very susceptible
Fire blight Very susceptible
Powdery mildew Some susceptibility
Burr knots None
Crown Gall Some susceptibility
Collar rot Some resistance
Replant complex Some tolerance
Root suckers Some
Crown rot Some resistance
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