ISHS Acta Horticulturae 767: XXVII International Horticultural Congress - IHC2006: International Symposium on Sustainability through Integrated and Organic Horticulture
EVALUATION OF DIFFERENT APPLE HYBRIDS FOR RESISTANCE TO APHIDS (DYSAPHIS PLANTAGINEA PASS. AND APHIS POMI DE GEER) IN BULGARIA: PRELIMINARY RESULTS |
| Authors: | H. Kutinkova, V. Dzhuvinov (Djouvinov) |
| Keywords: | rosy-apple-aphid, green-apple aphid, scab-resistant, tolerance, breeding, Integrated-Pest-Management |
| Abstract:
During 2004-2006, the resistance of apple hybrids to green apple aphid, Aphis pomi de Geer, and rosy apple aphid, Dysaphis plantaginea Pass. was assessed. Based on preliminary screening completed in 1998-2003, 19 hybrid combinations with a high resistance to scab and low susceptibility to powdery mildew and aphid infestations were selected for further evaluation. ‘Golden Delicious’ was used as a susceptible reference cultivar. Artificial infestation was carried out in two trials – in an unsprayed breeding orchard and on hybrid seedlings budded on M 26 rootstock, grown in pots. Some hybrids of 'Mollie's Delicious' × 'Florina', 'Mollie's Delicious' × 'Prima', 'Gloster' × 'Prima' and some seedlings of 'Florina' open pollinated (o.p.) and 'Liberty' o.p. manifested resistance to D. plantaginea. Other hybrids of 'Starkrimson' × 'Prima', 'Mollie's Delicious' × 'Florina', 'Mollie’s Delicious' × 'Prima', 'Winter Rambour' × 'Priscilla' as well as some hybrids of 'Florina' o.p. and 'Liberty' o.p. showed resistance to A. pomi. Combined resistance to both aphids has been found in the hybrids 'Mollie's Delicious' × 'Florina', 'Mollie's Delicious' × 'Prima' and in two hybrids of 'Liberty' o.p. It was confirmed that 'Florina' and 'Prima' are good donors of resistance to the aphids under study. | |
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