Pilidium lythri Is Associated with Bunch Rot of Grapevine (Vitis vinifera)
- Olga Aguín Casal 1
- Vanesa Ferreiroa 1
- Jesús M. González Jartín 2
- María Amparo Alfonso Rancaño 2
- Luis Miguel Botana López 2
- José Pedro Mansilla Vázquez 1
- María Jesús Sáinz Osés 3
- 1 Estación Fitopatolóxica Areeiro, Deputación de Pontevedra
- 2 Departamento de Farmacología, Universidad de Santiago de Compostela
- 3 Departamento de Producción Vegetal y Proyectos de Ingeniería, Universidad de Santiago de Compostela
ISSN: 0002-9254
Año de publicación: 2018
Volumen: 69
Número: 4
Páginas: 410-416
Tipo: Artículo
Otras publicaciones en: American Journal of Enology and Viticulture
Objetivos de desarrollo sostenible
Resumen
Bunch rot of Vitis vinifera is frequently caused by a complex of filamentous fungi. In a study on non-Botrytis fungi associated with bunch rot at harvest in northwestern Spain, rotting berries showing pink masses were observed in bunches of V. vinifera Albariño in one vineyard that experienced prolonged warm, moist conditions before harvest. The aim of this work was to identify the fungal species and determine its pathogenicity on grapes. Fungal isolates not corresponding morphologically to any known genus associated with bunch rot were obtained from the pink masses. Morphological and molecular phylogenetic analyses revealed that the isolates belonged to Pilidium lythri, an opportunistic pathogen causing tan-brown rot on strawberry. Most frequent non-Botrytis grape-rotting fungi at the vineyard were Penicillium brevicompactum, Penicillium expansum, and Talaromyces purpurogenus, while P. lythri had a low isolation frequency. Pathogenicity tests showed that P. lythri caused tan-brown rot in berries of the V. vinifera table grape varieties Regal Seedless and Red Globe. That P. lythri can directly infect healthy grape berries suggests that it may be a true pathogen associated with bunch rot on grapevine. Its presence on berries may contribute to postharvest decay of table and wine grapes.