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Mac An Tsaoir S.,Agri food and Bio science Institute Horticulture | Mansfield J.,Agri food and Bio science Institute Horticulture | Cross G.,Greenmount College | Harun R.,Greenmount College
Acta Horticulturae | Year: 2011

Apple Replant Disease (ARD) is caused when an old orchard is grubbed out and a significant pathogen population develops in the soil as the remaining root fragments rot. New roots from young tees planted into such sites are often attacked by these soil pathogens and suffer accordingly. MM.111 rootstocks with M.9 interstems are promoted in the British Isles as suitable for replant sites. Because 'Brameley's seedling' apple is such a vigorous cultivar, it is sometimes claimed that a replant site provides a useful check on 'Bramley' growth and is therefore an advantage. On both clean and replant sites the following densities were planted in 2000; D1 - 7.4×5.4 m (24'×18') open centre on a short stake, D2 - 5.4×3.6 m (18'×12') central leader on 2.5 m stake; D3 - 4.9×3.0 m (16'×10') central leader on 2.5 m stake and the control D4 - 4.3×2.4 m (14'×8') M.9 central leader. The accumulated results for 2004-2007 prove that in the case of 'Brameley's seedling', ARD infected ground significantly increased yield compared to the clean ground - 107 vs. 36 kg. On the clean sites the traditional planting density (D1) produced the lowest yield (16 kg) whilst the M.9 treatment generated the highest yield (61 kg). Source


Mac An Tsaoir S.,Agri food and Bio science Institute Horticulture | Mansfield J.,Agri food and Bio science Institute Horticulture | Ward F.,Agri food and Bio science Institute Horticulture | Archer J.,Agri food and Bio science Institute Horticulture
Acta Horticulturae | Year: 2011

The traditional system for growing 'Bramley's Seedling' apple has been as single staked trees with high density trellis systems rejected on the grounds that vigour control would be too difficult. The compact 'Bramley' clones produced by gamma radiation in 1968 had been rejected by the industry as being unsuitable for the traditional growing systems in Ireland. However, the compactness of the clones combined with the high density trellis systems, potentially could be very useful to the Irish apple industry. Thus, a replicated field trial of compact 'Bramley' clones (numbers 20, 36, 58, 68 and 91) on M.27 and M.9 rootstocks was established at Loughgall, Northern Ireland with the trees tied to a wire trellis. Standard 'Bramley's' were used as controls. All but one clone (58) yielded more fruit than the control under the trellis system. Significant differences were found in yield quality and mineral concentration between the controls and the mutants and there is definite potential in combining some of the clones with a trellis system for 'Bramley's Seedling' apple under Irish conditions. Source

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