M27

Very small tree.  No outstanding resistances; Small fruit size limits M 27 in commercial plantings.

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M9

M 9 is the major dwarfing apple rootstock in many areas of the world.
Trees are poorly anchored and require support.

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Mark

Use of Mark rootstock has been largely discontinued.  Mark gives early maturity and large fruit size,  and can be used in unfumigated replant in most soils, but it is not fullyreplant tolerant. Burr knots and woolly apple aphids limit use.  

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M26

Extremely susceptible to fireblight.  Should be planted only on free draining soils.  Woolly apple aphid susceptible.

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MM102

Better in replant sites and wet soils than MM 106.  Resistant to Woolly apple aphid.

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MM106

MM 106 was the standard rootstock in New Zealand until the 1990's, when medium density orchards of 660-800 trees/ha were the norm.  Not suitable in heavy clay soils due to phytophthora susceptability.

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Northern Spy

A hardy rootstock which is adapted to a wide variety of soil types yet producing good quality and yields of fruit. A favourite with home gardeners.  Resistant to phytophthora, peniophera and woolly apple aphids.

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M793

Replant without fumigation and phytophthora resistant.  Low yield efficiency.

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