Semi-dwarf rootstocks typically produce trees that are about 60% to 90% of standard size, with a height of about 14 feet to 22 feet, depending on the rootstock.
… Apple Rootstock Info: B.491
| Characteristic | Detail | Description |
|---|---|---|
| Rootstock | B.491 |
A very dwarfing rootstock from the Michurinsk College of Agriculture, former Soviet Union. Bud. 491 is reported to be very winter hardy with brittle wood and requires tree support. It is too dwarfing for most commercial situations, the wood is pink, it produces few burrknots and root suckers, but it is very susceptible to fire blight and Phytophthora. Bud. 491 was evaluated in the NC-140 1994 rootstock trial at 18 locations with the scion cultivar |
Dwarfing Apple Rootstocks
Dwarfing rootstocks typically produce trees that are about 25% to 60% of the size of trees on seedling rootstocks, with a mature height of about 6 feet to 12 feet. Depending on the soil, scion cultivar, and training system, trees on dwarf rootstocks can be spaced at 20 feet x 14 feet (173 trees per acre ) to 14 feet x 4 feet (778 trees per acre). Some of the more progressive apple growers, in regions with less vigorous growing …
Standard Apple Rootstocks
A standard size tree refers to trees growing on seedling or other non-dwarfing rootstock. If trees on standard rootstocks are not pruned to limit tree size, the trees will reach a height of about 30 feet and have a diameter of about 30 feet. Orchards planted before the 1960s often had only 40 trees per acre and were spaced 40 feet by 40 feet. With good pruning, standard size trees can be planted at about 26 feet x 20 feet …
Apple Rootstock Info: M.26
| Characteristic | Detail | Description |
|---|---|---|
| Rootstock | M.26 |
Resulted from a cross between M.16 and M.9 in 1929, at the East Malling Research Station, Maidstone, Kent, England. Traditionally considered a dwarf rootstock, but is one of the more vigorous dwarfing rootstocks. M.26 is grown widely throughout the world and is included as a “standard” in many rootstock trials. M.26 is precocious and very productive, produces many burrknots, and is susceptible to crown rot and fire blight. In a joint effort to produce virus |
Apple Rootstock Info: B.490
| Characteristic | Detail | Description |
|---|---|---|
| Rootstock | B.490 |
Originated from a cross of Red-Leaved Paradise (B.9) x Bud. 13-14 at the Michurinsk College of Agriculture, former Soviet Union. Bud. 490 is a semi-vigorous rootstock (similar in size and productivity to MM.106) that roots easily from hardwood cuttings or in the stoolbed. The inner bark is red. Trees on Bud. 490 are moderately precocious and produce some burrknots and few root suckers. Bud. 490 is moderately resistant to collar rot and fire blight and |
M.27, M.9 interstem with MM.106 rootstock
| Characteristic | Detail | Description |
|---|---|---|
| Rootstock | M.27, M.9 interstem with MM.106 rootstock |
Because many dwarfing rootstocks have less than the desired level of cold resistance and trees on all dwarfing rootstocks require support, dwarf rootstocks are sometimes used as interstems to combine the desirable characteristics of a vigorous understock and the dwarfing interstem. Interstem trees consist of three parts: a dwarfing rootstock (usually M.9 or M.27) is used as the interstem and is grafted onto a vigorous rootstock (usually MM.111 or MM.106) |
Apple Rootstock Info: B.118
| Characteristic | Detail | Description |
|---|---|---|
| Rootstock | B.118 |
Formerly Bud. 54-118. A semi-dwarfing rootstock from the Michurinsk College of Agriculture, former Soviet Union. Resulted from a’ Moscow Pear’ x M.9 or M.8 cross. Bud. 118 is reported to be a very cold hardy semi-dwarf rootstock and produces a tree about 85% of seedling. It is more precocious than seedling and can be grown without support. It is moderately resistant to fire blight, crown rot. There is very limited experience with Bud.118 in North |
M.27,M.9 interstem MM.111 rootstock
| Characteristic | Detail | Description |
|---|---|---|
| Rootstock | M.27,M.9 interstem MM.111 rootstock |
Because many dwarfing rootstocks have less than the desired level of cold resistance and trees on all dwarfing rootstocks require support, dwarf rootstocks are sometimes used as interstems to combine the desirable characteristics of a vigorous understock and the dwarfing interstem. Interstem trees consist of three parts: a dwarfing rootstock (usually M.9 or M.27) is used as the interstem and is grafted onto a vigorous rootstock (usually MM.111 or MM.106) and the |
Apple Rootstock Info: M.9
| Characteristic | Detail | Description |
|---|---|---|
| Rootstock | M.9 |
The pedigree is unknown and it was selected in England from a group of French genotypes known collectively as “Juane de Metz” in the late 1800s. M.9 is the most widely planted dwarf apple rootstock in the world and at least 30% of the trees in the U.S. are on M.9. M.9 EMLA is free of known viruses and is slightly more vigorous than the original M.9. Over the years European nurseries have selected clones |