I would also suggest that neighbouring rows are both a different cultivar and a different rootstock.
So a row of M25 then a row of MM111, then another row of M25.
Matching scion vigour to soil, climate and rootstock should still mean that all trees can be of similar size, growth rate and cropping.
This alternation between rows is to make if more difficult for the spread of airborne and soil-borne, cultivar-adapted strains of disease.
Scab on a row of trees? No problem - the rows to the East and West are not the same scion variety and generally have partial or high-level resistance to diseases from other cultivars.
Crown rot attacking the roots of one row of trees? No problem - the rows to the East and the West are on a different rootstock; partial or high-level resistance to diseases from other rootstocks.
Even consider "own root" or seedling stocks to help keep pests and diseases at bay for as long as possible (since both own root and seedling are genetically distinct from modern "cloned" rootstocks, so should show partial resistance to diseases which attack the cloned rootstocks).
So a row of M25 then a row of MM111, then another row of M25.
Matching scion vigour to soil, climate and rootstock should still mean that all trees can be of similar size, growth rate and cropping.
This alternation between rows is to make if more difficult for the spread of airborne and soil-borne, cultivar-adapted strains of disease.
Scab on a row of trees? No problem - the rows to the East and West are not the same scion variety and generally have partial or high-level resistance to diseases from other cultivars.
Crown rot attacking the roots of one row of trees? No problem - the rows to the East and the West are on a different rootstock; partial or high-level resistance to diseases from other rootstocks.
Even consider "own root" or seedling stocks to help keep pests and diseases at bay for as long as possible (since both own root and seedling are genetically distinct from modern "cloned" rootstocks, so should show partial resistance to diseases which attack the cloned rootstocks).
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