Rootstock comparison table
Rootstock | Ottawa 3A |
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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 | |
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Species compatibility | Apple |
Vigour % of standard | 30% - 40% |
Growing
Ottawa 3A | |
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Rootstock size class | Dwarf |
Precocity | Precocious |
Support required | Permanent support |
Climate
Ottawa 3A | |
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Cold-hardiness | Cold-hardy |
Cold hardiness (USDA) | Zone 4 (-34C) |
Identification
Ottawa 3A | |
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Country of origin | Canada |
Period of origin | 1950 - 1999 |
Problems
Ottawa 3A | |
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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 |