Originally posted by orangepippin
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To some extent it will depend on scion, soil and management but M26 is only suitable for small espaliers.
Basically whatever the size the mature tree might reach is about the same span that can be achieved with a properly-managed espalier.
For a 4-5m espalier MM111 or M25 may indeed be required unless the soil is good, the scion particularly vigorous or the tree well-tended.
Not spraying a tree against aphids (insecticide which may also affect bees) can result in quite a debilitating quantity of sap being sucked out by the aphids and potentially "dwarfing" the tree much more than expected.
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