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POSTERS: Epidemiology I

P-235 - Susceptibility of grapevine pruning wounds to Neofusicoccum spp. infections from grapevines and apples in the Maule Region, Chile

Monday, August 4, 2025
3:45 PM - 4:30 PM HST
Location: Exhibit Hall 3
Abstract Text:

Botryosphaeria dieback is one of the most important grapevine trunk diseases (GTDs) in Central Chile. Pruning wounds serve as the primary entry point for these pathogens in vineyards. Despite increasing knowledge of the interaction between Botryosphaeriaceae species and grapevines, the duration for which pruning wounds remain susceptible under local climatic conditions in Chile is still unknown. This study aims to determine the susceptibility period of pruning wounds to Neofusicoccum isolates obtained from apples and grapevines in vineyards of the Maule Region. Experiments were conducted on rooted cuttings (greenhouse) and lignified canes (vineyard), using a mycelial fragment suspension of N. parvum (grapevine) and N. arbuti (apple). Inoculation was performed one day after pruning and at two-week intervals for 60 days. The results indicate that pruning wounds are more susceptible to infection by N. parvum and N. arbuti during the first 15 days, with lesion lengths of 119.6 and 83.1 mm in cuttings and 52.3 and 39.2 mm in vineyards. N. parvum causes significantly larger lesions than N. arbuti at all pruning wound ages. The susceptibility of pruning wounds persists up to 45 days, especially for N. parvum, while minor damage is still observed at 60 days, indicating prolonged vulnerability. These findings highlight the importance of protecting pruning wounds for an extended period to mitigate the risk of infection.