ISHS Acta Horticulturae 556: V International Congress on Hazelnut
INCIDENCE OF APPLE MOSAIC ILARVIRUS (ApMV) IN CATALONIA (SPAIN) AND ITS EFFECTS ON ‘NEGRET’ HAZELNUT |
| Authors: | M. Rovira, J. Aramburu |
| Keywords: | Corylus avellana, filbert |
| Abstract:
The incidence of apple mosaic ilarvirus (ApMV) in ‘Negret’ hazelnut from Catalonia (northeastern Spain) was very high. The virus was present in all of the 160 hazelnut orchards surveyed during 1997 and 1998. The effect of the virus on ‘Negret’ was determined in a plot over a 10-year period (1989-1999). A comparison of virus-free trees and trees infected by grafting was made over a period of seven years for growth, yield and nut characteristics. The yield from healthy trees after four years was 77% higher than the yields from ApMV-infected trees. The difference was mainly due to the production of more nuts by healthy trees and not to differences in nut weight. The percentage of nuts with a brown spot in the kernel cavity was significantly higher for healthy trees, and no differences in the relative number of blank nuts or fatty acid composition of kernels were found. Natural infection of ‘Negret’ hazelnut by ApMV was also studied. The virus was detected by ELISA in 15% of the non-grafted trees ten years after orchard planting. These trees may have been infected by pollen because 8% of the seeds from healthy trees were positive for ApMV. This percentage of infected seeds increased to 54% in ApMV- hazelnut trees and, in a few cases, the virus was also detected in the corresponding involucre. | |
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