Apple Rootstock Info: Mark

Characteristic Detail Description
Rootstock Mark

An open-pollinated seedling of M.9 and introduced by Michigan state University, USA in 1979. It is a virus-free clone of MAC-9. Mark is a hardy, precocious dwarfing rootstock. It is susceptible to fire blight and fairly resistant to crown and root rots, produces many burr knots and few root suckers. Mark requires tree support. Trees are very precocious and tree vigor may decline earlier than desired when young trees are allowed to produce heavy crops

Apple Rootstock Info: Supporter 1

Characteristic Detail Description
Rootstock Supporter 1

Resulted from a cross between M.9 and Malus baccata (L.) Borkh. Supporter 1 was tested at seven locations in the NC-140 1999 trial with ‘Fuji’ as the scion cultivar. Supporter 1 trees had good survival and trees were about 75% as big as M.9 NAKBT337, produced similar numbers of root suckers as M.9 and had slightly high yield efficiency than M.9. European tests indicate it is quite cold hardy.

Synonyms Supp1
Origin M9 X

Apple Rootstock Info: Ottawa 3

Characteristic Detail Description
Rootstock Ottawa 3

Introduced by the Agriculture Canada Research Station in Ottawa, Ontario, Canada in 1974 as a hardy dwarfing rootstock. The parents were M.9 and ‘Robin’ crab. Ottawa 3 roots poorly in the stoolbed and is often micropropagated. Trees are precocious and produce few rootsuckers and burrknots. It is sensitive to apple stem grooving virus. Ottawa 3 was included in the 1990 NC-140 cultivar/rootstock trial at 12 locations and the 1990 dwarf rootstock trial at 8

Apple Rootstock Info: Supporter 4

Characteristic Detail Description
Rootstock Supporter 4

Formerly selected as Pi 80 and resulted from a cross between M.9 and M.4. European reports indicate the vigor is similar to M.26 with good resistance to low temperatures, but susceptible to fire blight and it produced few root suckers. Supporter 4 is being tested in the 2002 NC-140 trial at nine locations with ‘Gala’ as the scion cultivar. After five years tree survival and tree size were similar to M.26 and it produced

Apple Rootstock Info: Seedling

Characteristic Detail Description
Rootstock Seedling

Seedling rootstocks are usually produced from seeds obtained from apple juice plants and are typically ‘Delicious’. Because seedling rootstocks are not clonal, one might expect more tree-to-tree variation than with clonal rootstocks. Trees on seedling rootstocks are considered full sized trees (100% standard) and well pruned mature trees will typically be about 16’ to 18’ tall with a canopy diameter of about 13’ to 16’. Trees on seedling rootstocks generally have good survival, are free-standing,