Apple Rootstock Info: G.202

Characteristic Detail Description
Rootstock G.202

G.202 is a semi-dwarfing rootstock that produces a tree slightly larger than M.26. It is a cross of Malling 27 and Robusta 5. It is fire blight and phytophthora resistant, but also has good resistance to woolly apple aphid, which is important in many warmer climates where woolly apple aphid is a rootstock pest. G.202 performs very moderately well in the stoolbed and produces good quality nursery trees.

G.202 has been tested mostly in New

Apple Rootstock info: B.10

Characteristic Detail Description
Rootstock B.10

Formerly Bud. 62-396. It is a release from the Michurinsk University of Agriculture (Russia) breeding program, which is trying to select for improved winter hardiness. A 10-year trial in Pennsylvania with Golden Delicious as the scion cultivar showed that trees on this rootstock were similar in size to trees on G.935 and M.9 T337 (15 percent smaller). Main scaffold branch angle was close to 90 degrees. Production efficiency and total yield were slightly better than

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

Standard Apple Rootstocks

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 …

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 …

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.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