Ottawa 3 apple rootstock
This information forms part of Agfact H4.1.10 Apple rootstock identification.
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Ottawa 3 branch |
Ottawa 3 leaf |
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| Origin | Harrow, Ottawa, Canada. Robin × M.9 (1961). |
| Description | Leaf: large, light green, partly upfolded and curled back, dullish. Shape: oval with acute to attenuate tip and rounded base. Margin: fine neat serrations. Stipules: prominent, lanceolate to elliptical. Shoot: greyish orange. |
| Vigour | Dwarfing, similar to M.9 but slightly larger. |
| Propagation | Difficult, harder than M.9. |
| Resistance | Collar rot resistant. Woolly aphid and fireblight susceptible. Sensitive to tomato ring spot virus. |
| Uses | Better anchored than M.9, highly productive potential, less brittle than M.9, used as an interstem. Not fully tested in Australia. |