Native isolates of Trichoderma spp. can protect pruning wounds against Lasiodiplodia theobromae in Argentinian vineyards, reducing the incidence of Hoja de Malvón disease

Abstract

One of the principal way of sustainable managing of grapevine trunk diseases is to prevent opportunistic pathogen to entry through the pruning woods. The application of biocontrol organisms on pruning wounds could be a possibility to reduce infection from pathogens that cause the common disease in Argentina: called “Hoja de Malvón” (HdM). This name refers to the fact that a diseased grapevine leaf resembles a geranium leaf. Lasiodiplodia theobromae (Lt) is one of the most prevalent fungi associated with HdM at different pruning times. The present study was carried out to determine the protective effect of native Trichoderma spp. isolates with the highest in vitro inhibitory potential against Lasiodiplodia theobromae on pruning wounds.