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Neofusicoccum parvum and Rhizoctonia solani are fungal pathogens with an increasing incidence in young grapevine plants. In this study, the antagonistic potential of some strains of the genus Trichoderma isolated from grapevine against these pathogens was investigated at the laboratory and greenhouse levels. In-plate confrontation assays showed that the selected Trichoderma strains could inhibit the mycelial growth of both taxa, being more effective against N. parvum. In the in vivo assays, the biocontrol activity of the mentioned strains against the pathogens, when applied either simultaneously or successively, was tested on both grafted plants and seedlings germinated from seed. The effectiveness of the treatments was evaluated by comparing biomass weight and vascular rot lengths data. In seedling trials, successive treatments resulted in higher root development and a lower colonization rate of the pathogens, especially against R. solani. In grafted plants, some disparity was observed against N. parvum: simultaneous treatments resulted in higher aerial biomass, but successive treatments resulted in higher root biomass and lower necrosis. Against R. solani, simultaneous treatments were clearly more effective, with higher root and aerial length values and lower necrosis. The obtained data suggest that the use of Trichoderma spp. isolates can constitute an alternative to conventional fungicides to control certain grapevine wood diseases.

Potential of Native Trichoderma Strains as Antagonists for the Control of Fungal Wood Pathologies in Young Grapevine Plants