Evaluation of six red grapevine cultivars inoculated withNeofusicoccum parvum

摘要

Botryosphaeria dieback (BD) is a serious grapevine trunk disease (GTD) that causes large losses in yield and shortens the productive life of vineyards.Neofusicoccum parvumis one of the main causal agents of BD. Currently there are no curative fungicides to eradicate this disease; therefore, the use of tolerant cultivars to BD could be considered an interesting and sustainable alternative for its control. For this purpose, rooted cuttings of six redVitis viniferacultivars were selected and inoculated withN. parvum, under field conditions, over 2 consecutive years. Eight months after inoculation, plants were collected and inspected for lesion development. The fungal incidence varied depending on the cultivar and ranged from 42.1% in "Monastrell" cultivar to 93.3% in "Tinto Velasco" cultivar, evidencing a lack of qualitative resistance toN. parvum. The severity of internal wood symptoms caused byN. parvumdiffered considerably amongst the cultivars, being "Bobal" and "Monastrell" more tolerant than "Tinto Velasco" cultivar.