Phaeoacremonium species associated with Eutypa dieback and esca of grapevines in Algeria

Akila BERRAF-TEBBAL, ZOUAOUI BOUZNAD, JORGE Manuel SANTOS, MARCO COELHO, JEAN PIERRE PÉROS, ALAN JOHN LANDER PHILLIPS

Abstract


Algerian grapevines showing symptoms of Eutypa dieback and esca were examined for the presence of Phaeoacremonium species. Species were identified on the basis of morphological and cultural characteristics as well as DNA sequence data (β-tubulin and actin). From a total of 200 vines sampled, 61 Phaeoacremonium isolates were obtained corresponding to four different species. Pm. aleophilum was the most frequently isolated (n=42) followed by Pm. parasiticum (n=10) and Pm. venezuelense (n=8). Pm. hispanicum was also found but only once. Phaeoacremonium species were more frequently associated with Eutypa dieback than esca symptoms. This correlates with their frequent association with sectorial brown necrosis (V-shaped necrosis).

Algerian grapevines showing symptoms of Eutypa dieback and esca were examined for the presence of Phaeoacremonium species. Species were identified on the basis of morphological and cultural characteristics as well as DNA sequence data (β-tubulin and actin). From a total of 200 vines sampled, 61 Phaeoacremonium isolates were obtained corresponding to four different species. Pm. aleophilum was the most frequently isolated (n=42) followed by Pm. parasiticum (n=10) and Pm. venezuelense (n=8). Pm. hispanicum was also found but only once. Phaeoacremonium species were more frequently associated with Eutypa dieback than esca symptoms. This correlates with their frequent association with sectorial brown necrosis (V-shaped necrosis).


Keywords


Actin; β-tubulin; phylogeny; wood disease

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DOI: http://dx.doi.org/10.14601/Phytopathol_Mediterr-9025



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