- See also:
- Intermediate dwarf10
Ottawa 3ADwarf M9 class rootstock
| Used for: | Apple |
| Developed by: | Agriculture and Agri-Food, Canada |
| Country of origin: | Canada |
| Parentage: | Ottawa 3 |
Ottawa 3A as compared to ‘O.3’; shows increased precocity, higher cumulative yield efficiency, and wider branch angles.
Ottawa 3A rootstock characteristics
- Species compatibilityApple
- Vigour % of standard30% - 40%
- Rootstock size classDwarf
- PrecocityPrecocious
- Support requiredPermanent support
- Cold-hardinessCold-hardy
- Cold hardiness (USDA)(4) -30F / -34C
- Country of originCanada
- Period of origin1950 - 1999
- Virus toleranceVery susceptible
- Woolly aphidVery susceptible
- Fire blightVery susceptible
- Powdery mildewSome susceptibility
- Burr knotsNone
- Collar rotSome resistance
- Crown GallSome susceptibility
- Crown rotSome resistance
- Replant complexSome tolerance
- Root suckersSome
Find our more about this rootstock in the 'Manual of Worldwide Temperate Zone Fruit and Nut Tree Rootstocks'.