Susceptibility of 15 Apple Cultivars to Apple Scab,Powdery Mildew, Canker and Mites

Abstract

Field resistance of 15 apple cultivars to diseases and pests was evaluated by not treating with pesticides during the observation period. The level of apple scab, powdery mildew, canker and fruit tree spider mites was assessed. The cultivars ‘Discovery,’ ‘Filippa,’ and ‘Bramleys Seedling’ showed low susceptibility to scab. ‘Mutsu,’ ‘Summerred,’ ‘Gravenstein’ and in some cases ‘Cox’s Orange,’ ‘Guldborg’ and ‘Red Ananas’ were very susceptible to scab. ‘Belle de Boskoop,’ ‘Bramleys Seedling’, ‘Discovery,’ ‘Filipa,’ ‘Ingrid Marie’ and ‘Mutsu’ had low susceptibility to powdery mildew, whereas ‘Ildrod Pigeon’ was sensitive to powdery mildew, ‘Belle de Boskoop,’ ‘Bramleys Seedling,’ ‘Filippa’ and ‘Red Ananas’ were not sensitive to canker. ‘Discovery’ and ‘Transparente Blanche’ were most susceptible to canker. ‘Belle de Boskoop,’ ‘Cox’s Orange,’ ‘Gravenstein,’ ‘Mutsu’ and ‘Skovfoged’ had low susceptibility to spider mites. ‘Red Ananas,’ ‘Filippa,’ ‘Discovery,’ ‘Guldborg’ and ‘Ildrod Pigeon’ were attacked by spider mites.