UNIDAD ASOCIADA "SISTEMAS AGROFORESTALES": ESTACIÓN FITOPATOLÓXICA DO AREEIRO - MISIÓN BIOLÓGICA DE GALICIA
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UNIDAD ASOCIADA "SISTEMAS AGROFORESTALES": ESTACIÓN FITOPATOLÓXICA DO AREEIRO - MISIÓN BIOLÓGICA DE GALICIA |
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| Home » Publications » Papers » 2007 |
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Reunión
Científica del Grupo de Trabajo de Sanidad Forestal de La Sociedad
Española de Ciencias Forestales Palencia, 25 - 26 de September 2007
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| Patogenicidad de los tipos de compatibilidad vegetativa de Cryphonectria parasitica en Galicia MONTENEGRO, D.¹; AGUÍN, O.¹; SAINZ, M.J.²; MANSILLA, J.P. 1,2 ¹Estación Fitopatolóxica do Areeiro. Excma. Diputación Provincial de Pontevedra. Subida a la Robleda s/n. 36153 Pontevedra. efa@efa-dip.org ²Departamento de Producción Vegetal, Universidad de Santiago de Compostela, Campus Universitario, 27002 Lugo, España. |
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ABSTRACT: Cryphonectria parasitica, ascomycete agent of chestnut blight, presents a vegetative compatibility system restricting heterocaryon formation. This system contributes to the success of biological control programmes, since C. parasitica hypovirulence is transmitted by hyphal anastomose. In Galicia eight vegetative compatibility types (vc) were established and presented differences in their dissemination and abundance. The objective of this work was to determine whether these eight groups presented different levels of virulence. A pathogenicity test was carried out, using chestnut trunk sections, collected in the field. These sections were inoculated with inoculum from C. parasitica isolates belonging to the eight vc groups detected in Galicia. The virulence degree was estimated observing the size of the necrotic area produced by the fungus, as well as the morphological characteristics of the growing mycelium. Thus, five incidence levels were established depending on the degree of disease development. All types produced infection, although virulence varied among groups. Results showed that vc H was the less virulent, with an incidence of 40%, and the vc type C was the most virulent having 90% incidence. Keywords: Castanea sativa, chestnut blight, Cryphonectria parasitica, vegetative compatibility, pathogenicity |
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