Submitted to: American Phytopathological Society Abstracts
Publication Type: Abstract Only
Publication Acceptance Date: 6/15/2021
Publication Date: 10/1/2021
Citation: Wallis, C.M. 2021. Testing and utilization of grapevine-isolated Trichoderma spp. for improved control of grapevine trunk diseases. American Phytopathological Society Abstracts. 111. https://doi.org/10.1094/PHYTO-111-10-S2.1.
Technical Abstract: Grapevine trunk diseases, including canker diseases caused by fungi and Pierce’s disease caused by the bacterium Xylella fastidiosa, can be difficult to control once established within a vineyard. Current management involves the use of pesticides to reduce inoculations. However, sustainable management will require alternative, longer-lasting control options. Therefore, grapevine isolates of Trichoderma spp. were obtained in California vineyards to assess ability to reduce incidence and severity of different grapevine trunk diseases. Thus far, a total of six new Californian Trichoderma spp. isolates from grapevines have exhibited strong ability to limit growth of the fungal pathogens Diplodia seriata, Eutypa lata, and Neofusicoccum parvum in culture plate assays. Two of these isolates also have been tested for the ability to limit growth in planta, and grapevines treated with these two Trichoderma spp. isolates had significantly reduced Diplodia seriata and Xylella fastidiosa infection progression. Currently, additional isolates are being obtained and both further in vitro and in planta testing is proceeding. Identification of new Trichoderma spp. isolates to control fungal pathogens and Xylella fastidiosa should provide new, complementary options for grapevine trunk disease management.