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D2212 is a Malus domestica cv. Laxton’s Superb x M. sieboldii that is very resistant to Apple proliferation (AP). It very much in trial stages, with regards to height but it is similar to M7 ie 3m - 4m.
Apple proliferation (AP) is a bacterium Candidatus Phytoplasma mali’ and is wide-spread in several major fruit-growing areas in Europe. is of considerable economic importance due to its negative effect on tree productivity and fruit quality.
The disease was first reported from northern Italy in 1950. In the following decades, the occurrence of AP was reported from most European countries.
The symptoms are either specific such as witches’ brooms, enlarged stipules, undersized and unmarketable fruits, either non-specific such as foliar reddening, yellowing and growth suppression.
Undersized and unmarketable fruits are the main economic losses due to AP. While fruit number is usually not affected, fruit weight is often reduced by 30-60%, the fruit colour is unsatisfactory, and the taste is poor, with the result that as much as 80% of the fruit is unmarketable.
Disease incidence and severity is higher in trees on vigorous rootstocks such as M 4, M 11 and MM 104 than on dwarfing rootstock such as M 9.