Tag: rootstock info

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Interstem Apple Trees

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:

  1. A vigorous rootstock (usually MM.111 or MM.106) 
  2. A dwarfing (usually M.9 or M.27) interstem is grafted to the rootstock. The interstem is usually about 6” long, but additional dwarfing can be obtained by
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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
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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
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Apple Rootstock Info: Alnarp 2

 

Characteristic
Detail                      
Description
Alnarp 2
 
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
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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

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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,

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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

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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

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Apple Rootstock Info: G.935

Characteristic Detail Description
Rootstock G.935

G.935 is a 1976 cross of Ottawa 3 and Robusta 5. Size is reported to be slightly larger than M.26, but the rootstock has resistance to fire blight and crown rot. It is not resistant to woolly apple aphid. Production efficiency is rated equal to M.9. In the Golden Delicious trial at Rock Springs in 2006, tree size was about 9 percent larger than M.9 and 12 percent smaller than M.26. Production efficiency was not

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Apple Rootstock Info: G.11

Characteristic Detail Description
Rootstock G.11

Resulted from a cross of M.26 and Robusta 5 crabapple and introduced in 1993 by the New York State Agricultural Experiment Station, Geneva, NY. G.11 is one of the more vigorous dwarfing rootstocks and produces a tree similar in size to M.26. It is precocious (similar to M.26), moderately resistant to fire blight, moderately susceptible to woolly apple aphid and crown an root rots, and requires trunk support, especially in the early years. It produces

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