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APPLE ROOTSTOCKS
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SIZE CLASS 6 |
M.7 | |||
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Pedigree |
Unknown: M.7 is an English selection of French apple rootstocks. |
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Precocity |
Somewhat precocious | |||
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Productivity |
Moderate to low under most conditions, can be high | |||
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Scion Fruit Size |
Fruit size is often small with M.7 | |||
| Scion Fruit Quality | Generally fine | |||
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Anchorage |
Good, typically free-standing when mature | |||
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Fire blight |
Resistant | |||
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Crown & Root Rots |
Considered resistant | |||
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Woolly Apple Aphid |
Susceptible | |||
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Powdery Mildew |
Moderately resistant | |||
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Hardiness (Midwinter) |
Highly questionable - probably less hardy than M.9 | |||
| Bud Break | ||||
| Leaf Fall | ||||
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Suckering |
Heavy | |||
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Burrknots |
Light | |||
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Stoolbed Performance |
Very good | |||
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Virus hypersensitivities |
Tolerant | |||
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Experience |
Well tested | |||
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Sources |
Most commercial sources | |||
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Strains |
M.7a - virus reduced clone. M.7 EMLA - virus free clone has slightly increased vigor. | |||
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Observations, suspicions, history |
M.7 can be a good choice, particularly in marginal apple production areas, due to the high tolerance it exhibits to fire blight and root diseases. M.7 is especially useful with spur-type scion cultivars and on very poor sites. Use of M.7 is declining in North America because it has only moderate productivity for most applications and suckers heavily. |
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