| 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: MM.111 EMLA
| Characteristic | Detail | Description |
|---|---|---|
| Rootstock | MM.111 EMLA |
Introduced in 1952 from a cross of Merton 793 x ‘Northern Spy’ by the John Innes Horticultural Institute and the East Malling Research Station in England. MM.111 EMLA is one of the more vigorous semi-dwarf rootstocks, producing a tree about 85 to 100% the size of seedling. It is resistant to wooly apple aphid and is quite tolerant to fire blight and crown and root rots. It is fairly winter hardy and produces moderate |
Apple Rootstock Info: MM.106 EMLA
| Characteristic | Detail | Description |
|---|---|---|
| Rootstock | MM.106 EMLA |
Selected in 1932 from a cross of M.2 x ‘Northern Spy’ by the John Innes Horticultural Institute and the East Malling Research Station in England. MM.106 EMLA is a semi-dwarf rootstock, producing a tree about 60% the size of seedling. It is quite precocious and productive and usually does not need tree support. It is resistant to wooly apple aphid, but is highly susceptible to crown and root rots, susceptible to fire blight, and |
Apple Rootstock Info: M.27 EMLA
| Characteristic | Detail | Description |
|---|---|---|
| Rootstock | M.27 EMLA |
Selected in 1934 from a cross of M.13 x M.9 at East Malling Research station in Maidstone, Kent, England and was tested as Malling 3431. M.27 EMLA is a very dwarfing rootstock and is probably too dwarfing for most commercial situations except for vigorous cultivars on vigorous sites, but it might be considered for home gardens where a small tree is desirable.. Trees on M.27 EMLA are very precocious and productive and require permanent |
Apple Tree Viruses
Virus and Other Graft-Transmissible Diseases and Disorders of Apples
Virus diseases cause economic losses through lower yields and reduced quality of apples and apple products. In general, virus diseases in perennial crop plants, such as apples, are more potentially damaging than in annual crops. Viruses can remain latent, spreading through an orchard and inflicting damage, often without the growers’ knowledge. Latent virus infection can produce small to moderate losses in fruit production. Often growers can maintain the productivity of diseased …
Apple Rootstock Info: M.7 EMLA
| Characteristic | Detail | Description |
|---|---|---|
| Rootstock | M.7 EMLA |
Formerly known as EM VII. Selected in 1912 from unknown parentage at the East Malling Research station in Maidstone, Kent, England. Trees on M.7 EMLA produce a semi-dwarf tree about 60 to 70% as big as seedling. Trees are moderately precocious and may lean with some cultivars and may require trunk support. Trees tend to produce many rootsuckers. M.7 EMLA has been widely planted since the 1960s with cultivars such as ‘McIntosh’, ‘Empire’, ‘Cortland’, |
Apple Rootstock Info: B.9
| Characteristic | Detail | Description |
|---|---|---|
| Rootstock | B.9 |
Resulted from a cross of M.8 x ‘Red Standard’ (Krasnij Standard) from Russia. B.9 has been tested widely and is used commercially in the U.S. In general, B.9 is slightly more dwarfing than M.9 and has slightly higher yield efficiency than M.9. B.9 was selected as a dwarfing cold hardy rootstock and initial inoculation results indicated that it was as susceptible to fire blight as M.9. However, in field trials, trees grafted onto B.9 survived |
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 |