| Characteristic | Detail | Description |
|---|---|---|
| Rootstock | G.16 |
Resulted from a cross between Ottawa 3 and Malus floribunda and introduced by the New York State Agricultural Experiment Station, Geneva, NY. G.16 is a dwarfing rootstock and produces a tree similar in size to M.9. It is very precocious and has productivity similar to M.9, and requires full tree support. It is highly resistant to fire blight, quite resistant to crown and root rots, but susceptible to woolly apple aphid. G.16 is hypersensitive to |
Planting Apple Trees
The Best Time to Plant
We have routinely advised growers in the upper Midwest to plant bare rooted trees mid- to late March, April or June (June? Why not May?). Several research studies have demonstrated the advantages of planting as soon in the spring as the soil conditions will allow. Trees planted in April have a decided advantage over those planted even one month later. As temperatures increase in late spring, trees planted late will break bud sooner and struggle …
Apple Rootstock Info: G.30
| Characteristic | Detail | Description |
|---|---|---|
| Rootstock | G.30 |
Resulted from a cross between M.9 and Robusta 5 and introduced by the New York State Agricultural Experiment Station, Geneva, NY. G.30 produces a fairly vigorous dwarf tree, similar in size to M.26. Precocity and productivity are also similar to M.26. G.30 is highly resistant to fireblight and quite resistant to crown and root rots, but susceptible to woolly apple aphid. G.30 was tested at 20 locations in the NC-140 1994 semi-dwarf rootstock trial with |
Sunburn of Apple
Sunburn damage is a skin discoloration of the exposed side of the fruit. Three different types of sunburn can be distinguished based the conditions of their formation;
- Sunburn browning is the most common type caused by the concomitant action of radiant heating and UV-B exposure. The symptoms are yellowish, brownish patches on the sun-exposed side of the fruit. Symptoms occur on the surface of the fruit (epidermis and hypodermis) but do not penetrate into the core tissues.
- Sunburn necrosis is
Apple Rootstock Info: G.969
| Characteristic | Detail | Description |
|---|---|---|
| Rootstock | G.969 |
G.969 is a semidwarfing rootstock that is resistant to fire blight, crown rot, and woolly apple aphid. It is classified as having growth control between M.7 and MM.106. The rootstocks produce few root suckers or burr knots. Suggested for trial for growers desiring a freestanding tree. |
| Synonyms | Geneva 969 | |
| 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 research |
Apple Tree Propagation: Budding
T-budding or chip budding are the most commonly used methods of apple tree propagation. The best time for T-budding depends on the maturity of the buds to be transferred and on the ease with which the bark “slips” or peels on the stock being budded. In a normal season, T-budding is possible from June to September. Chip budding can be used when the bark is not slipping, for example, in early spring before growth begins or during early summer when …
Apple Rootstock Info: Antonovka 313
| Characteristic | Detail | Description |
|---|---|---|
| Rootstock | Antonovka 313 |
This is a non-dwarfing rootstock from Russia and produces a free-standing tree that is 100% standard size. Trees are slow coming into bearing and moderately productive, and trees may lean slightly in some situations. Although some nurseries advertise Antonovka 313 to be very cold hardy, it is usually considered moderately cold hardy and may be susceptible to late-winter cold. It is adapted to a wide range of soil conditions, and is reportedly resistant to |
Apple Rootstock Info: Alnarp 2
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Characteristic
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Detail
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Description
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|---|---|---|
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Alnarp 2
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Introduced by the Alnarp Fruit Tree Station, in Alnarp, in southern Sweden in 1944. Alnarp 2 was selected in 1920 from a group of mixed Doucin (dwarf) trees and it was brought to the US in 1949. This clonal rootstock propagates easily in the stool bed and produces a free-standing semi-vigorous tree 85 to 90% the size of seedling. Alnarp 2 is very cold tolerant and has been used as an understock for interstem |
Apple Rootstock Info: P.22
| Characteristic | Detail | Description |
|---|---|---|
| Rootstock | P.22 |
Resulted from a cross of M.9 x Common Antonovka and released Research Institute of Poland in Skierniewice, Poland. This is a very dwarfing rootstock, producing trees similar in size to M.27. Trees have good winter hardiness, and produce few burr knots and rootsuckers. It is moderately susceptible to fire blight and very susceptible to woolly apple aphid, and has good resistance to crown and root rots. P.22 is very precocious, has higher yield efficiency than |
Apple Rootstock Info: P.18
| Characteristic | Detail | Description |
|---|---|---|
| Rootstock | P.18 |
Resulted from a cross of M.4 x Common Antonovka and released by the Research Institute of Poland in Skierniewice, Poland. This is a nondwarfing rootstock with vigor similar to seedling. It has not been tested widely in North America, but based on a trial in Illinois P.18 was less precocious and had lower yield efficiency than MM.111. Inoculation tests in California indicate it is moderately resistant to phytophthora. It is susceptible to wooly apple aphid, |