Malling 7 produces an open spreading semi-dwarf apple tree. It’s a sturdy, disease resistant, winter hardy, uniform, productive rootstock that adapts well and transplants easily. It does beast on deep, fertile, well-drained soils that retain consistent moisture. Anchorage problems with some verities and heavy suckering are its most serious faults. It is resistant to Collar Rot but susceptible to Wooly Aphids.
Selected at East Malling from number of stocks of Juane de Mertz, M9 is a true dwarfing rootstocks. Useful for high-density plantings, it induces extremely heavy, early cropping. We offer several clones of M9 including EMLA , NAKB T.337, Nicoli 29, Pajam 1 (Lancep), and Pajam 2 (Cepiland). The variation of tree size among these various clones is small and grower’s cultural practices will play a greater role in determining final tree size. M9 is susceptible to Fireblight and Wooly Apple Aphid and highly tolerant to Collar Rot. Fruit tends to be larger than fruit from other rootstocks. M9 requires fertile soil with a consistent, ample moisture supply. Irrigation is strongly recommended. This rootstock must be supported by individual stakes or wire trellis because of the brittle roots.
Bred at East mailing from an M9 and very vigorous M16 cross, it is for high density plantings. M26 sizes between M9 and M7. Spur verities on M26 produce a dwarf tree similar to M0, but with better anchorage. Slightly less vigorous than M7, M26 produces superior quality fruit, cropping early. We suggest support for trees on M26, although some growers are going without. M26 promotes very heavy early beating on most verities and tends to stimulate large fruit size. It is hardy and, although it is adaptable to most soils, it is highly susceptible to collar Rot and should not be planted on wet or infected soils. M26 is also highly susceptible to Fireblight, and cautions should be taken when using this rootstock with blight-sensitive cultivars.
Budagovsky 9 (Bud 9)
A promising rootstock which is a cross of M9 X Red Standard. Tree size is slightly larger than M9. Tress of Bud 9 are precocious and yield good fruit size. It is hardier than M9 and produces few burr knots or root suckers. Bud 9 has disease susceptibility similar to M9 .
Mark (formerly Mac-9)
Developed from a series of apple rootstocks known as (MAC) Michigan Apple Clones by Dr. Robert Carlson, Michigan State University. Tree sizes are between M9 and M26. It is productive with good precocity. To avoid drought stress, Mark should be planted on soils that retain moisture. It is susceptible to Fireblight and Wooly Apple Aphid. Mark has a greater tolerance to flooding than M9, making it a good choice for heavier soils.
a cross of Robusta 5 X M9, CG.30 is similar to M7 in tree size but is much more precocious and productive. CG.30 has fewer root sucker and burr knots than M7. CG.30 provides excellent anchorage, is resistant to Fireblight, and tolerant to collar rot.
A heavy-bearing, well-anchored rootstock. It makes a tree somewhat larger than M7, and it rarely produces root suckers. MM106 is the outstanding stock in the semi-dwarf group in its ability to stimulate early and very heavy production of the scion variety. Years of grower experience has established that MM106 is ideal for spur types, particularity Red Delicious because of its precocity, tree size, and precocity, tree size, and productivity. MM106 is somewhat susceptible to Collar Rot and Wooly Aphids, but field experience has demonstrated that these problems are minor and controllable.
Quite upright with wide crotch angles. Best anchored of all dwarfing rootstocks. Very tolerant to drought and high soil temperatures. Early produces root suckers. Slower to come into bearing than M7 or MM106. It is the best semi-dwarf stock for heavy, poorly drained soil types. Quite resistant to Collar Rot. Recommended where vigorous growth is needed to offset poorer cropping capacity of dry, sandy soils.