Pomological researchers have assessed other approaches to determining potential yield. Since planting density works together with per-tree yield to determine productivity per acre, researchers have used canopy dimensions to estimate planting density and then estimated potential yield per acre. This approach is perfect if the trees used to measure yield and canopy size are not contained by any pruning. Once the canopy is manipulated, and particularly if it is manipulated differently for trees of different sizes, potential yield per acre …
Apple Rootstock Info: G.890
| Characteristic | Detail | Description |
|---|---|---|
| Rootstock | G.890 |
G.890 is a semidwarfing rootstock that is resistant to fire blight (Erwinia amylovora), crown rot (Phytopthora spp.) and woolly apple aphid. At this time production of root suckers and burr knots is unknown. Tree size is approximately the same as M.7 but with higher and earlier production. |
| Synonyms | Geneva 890 | |
| Origin | N/A | |
| Availability | Limited availability | |
| Tree Size | 70-75% | |
| Precocity | Intermediate | |
| Winter Hardiness | Hardy | |
| Suckering | N/A | |
| Tree Support Needed | No | |
| Where tested within NC-140 or other |
Apple Rootstock Info: G.65
| Characteristic | Detail | Description |
|---|---|---|
| Rootstock | G.65 |
G.65 was developed by Dr. Jim Cummins at Cornell University. Due to errors in tissue culture buildup of this rootstock, the U.S. distribution of this rootstock has been hindered. Tree size once thought to be about that of M.9 is now considered to be closer to M.27. The rootstock is difficult to propagate in nursery stool beds. It is susceptible to tomato ring spot virus and apple stem grooving virus. Not recommended for commercial planting. |
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: M.4
| Characteristic | Detail | Description |
|---|---|---|
| Rootstock | M.4 |
Selected in 1912 from unknown parents at the East Malling Research Station in Maidstone, Kent, England. M.4 is slightly dwarfing and produces a tree about 75-80% standard size. It is considered fairly precocious, and trees tend to lean and may require trunk support. M.4 is resistant to collar rot. In an Indian rootstock trial trees on M.4, MM.106, and MM.111 were all about the same size. Cumulative yield was greater than trees on MM.111, similar |
Apple Rootstock Info: J-TE-H
| Characteristic | Detail | Description |
|---|---|---|
| Rootstock | J-TE-H |
Released from Techobuzic, Czech Republic. The early descriptions from Czech researchers suggested that J-TE-H produces a tree about the size of trees on M.26 EMLA. In rootstock trials in the Czech Republic and Spain J-TE-H produced trees about 35 to 40% of standard size, trees produced a moderate number of root suckers, and yield efficiency was less than the other dwarfing rootstocks in the trial (Pajam 1, Pajam 2, M.9, and J-TE-E). J-TE-H was included |
Apple Rootstock Info: V.3
| Characteristic | Detail | Description |
|---|---|---|
| Rootstock | V.3 |
The Vineland series of apple rootstocks originated as open-pollinated hybrids of ‘Kerr’ crabapples and M.9 rootstock and were selected at the Horticultural Experiment Station at Vineland, Ontario, Canada in 1958. According to information from the Ontario Ministry of Agriculture, Food and Rural Affairs, V.3 is slightly smaller than M.9 EMLA and yield and yield efficiency is similar to M.9 EMLA. V.3 is cold hardy and somewhat resistant to fireblight. V.3 was included in the 1994 |
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: G.41
| Characteristic | Detail | Description |
|---|---|---|
| Rootstock | G.41 |
Resulted from a cross between M.27 and Robusta 5 and introduced by the New York State Agricultural Experiment Station, Geneva, NY. Geneva® 41 and has been tested as CG 3041 and is a full dwarf, similar in size to M.9 NAKBT337. It is highly resistant to fire blight and phytophthora and in initial tests; it appears to be tolerant of replant disease. It is being tested in the 2003 NC-140 trial at 12 locations with |
Apple Rootstock Info: V.1
| Characteristic | Detail | Description |
|---|---|---|
| Rootstock | V.1 |
The Vineland series of apple rootstocks originated as open-pollinated hybrids of ‘Kerr’ crabapples and M.9 rootstock and were selected at the Horticultural Experiment Station at Vineland, Ontario, Canada in 1958. According to information from the Ontario Ministry of Agriculture, Food and Rural Affairs, V.1 is in the M.26 size class, and yield and yield efficiency are usually greater than M.26. V.1 is cold hardy and somewhat resistant to fireblight. V.1 was included in the 1994 |