ISHS Acta Horticulturae 494: II International Symposium on Chestnut
THE PRODUCTION AND DISPERSAL OF ASCOSPORES OF CRYPHONECTRIA PARASITICA IN AN ORCHARD IN SOUTH-WESTERN FRANCE |
| Authors: | L. Guérin, S. Bastien, B. Chauvin |
| Keywords: | chestnut blight, Cryphonectria parasitica, ascospores, epidemiology |
| Abstract:
Perithecia production on chestnut blight cankers and release of ascospores from mature perithecia were studied in a naturally infested orchard in south-western France. The frequency of perithecia production and stages of maturity were determined by examining 107 cankers from the orchard. Perithecia were present on 42 % of cankers and in 6% to 34 % of the numerous stromata on sampled cankers. Release of ascospores was studied by two spore-trapping methods. In the first one, glass-slide traps were exposed in front of 10 cankers for 7-day periods during one year. The results showed that most ascospores were discharged from spring until autumn, with peaks coinciding with rainfall. In the second experiment, ascospores were trapped using a Burkard volumetric spore trap. Significant trapping of ascospores occurred in spring, summer and autumn. The pattern was similar to that observed in the first experiment but more spores were trapped in spring. | |
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