Our goal is to develop a new method to detect trunk diseases by sampling asymptomatic leaves. We revealed a unique set of grape genes expressed in asymptomatic leaves in the early phase of infection, using Botryosphaeria dieback pathogen Neofusicoccum parvum as a model to study host responses to a trunk pathogen. Tests are in progress to confirm specificity of these grape genes to Neofusicoccum infection, in inoculations with other trunk pathogens, common foliar pathogens, and to rule out possible interactions with drought stress.
Link to presentation:Early Detection
We as researchers think the preventative practices for trunk diseases are effective. We surveyed growers to see if they feel the same.
Link to presentation:Trunk Disease Management, grower usage and perspective of preventative practices.
The Nita lab is working on the interface for our projects which include: development of the project website; a web-based trunk disease app and other Extension materials; and trunk disease DNA database.
Link to Presentation: SCRI Trunk Disease Project Website and Database.
Renaud Travadon & Kendra Baumgartner
We developed methodologies to rapidly and reliably screen grapevines in the greenhouse. Now we are examining cultivars and germplasm for sources of resistance to trunk diseases, specifically Eutypa dieback and Phomopsis dieback.
Link to presentation: Evaluating grapevine germplasm for resistance to Eutypa Dieback.
This is a presentation about the progress we made in understanding the mechanisms underlying grape trunk diseases with the objective to (i) facilitate the development of more accurate diagnostic tools and (ii) assist the effort to identify genetic sources of tolerance in the grape germplasm.
Link to presentation: Molecular determinants of wood colonization by trunk pathogens
Philippe E. Rolshausen
The use of varieties resistant to trunk pathogens could mitigate some yield losses encountered by the grape, almond, and pistachio industries. The goal of our research is to identify resistant varieties and to understand the basis of resistance.
Link to presentation:”Identifying-biochemical-and-anatomical-markers-of-resistance-in-grape-almond-pistachio-wood (3)“
This is a presentation about some of the progress we’ve made on the economic benefits of adoption of preventative practices in young vineyards years before trunk disease symptoms might appear in the vineyard. We set out to determine whether growers might benefit from using these practices in young and mature vineyards.
Link to presentation: Economic benefits of disease prevention in young vineyards
Philippe E. Rolshausen
Rohslausen discusses how cell wall chemical composition and differences in wood anatomy could be responsible for variance in susceptibility between different cultivars.
Link to the presentation: “Identifying biochemical and anatomical markers of resistance in grape, almond & pistachio wood“
Mizuho Nita, and Sabrina Hartley
Progress update on development of web and mobile diagnostic application that will enable growers to properly diagnose trunk vine diseases and in return help determine proper management practices for the specific trunk disease identified.
Link to the presentation: Development of web application of grapevine trunk diagnostic tool
-Possible pathogen detection tools for growers.
-Evaluate and improve culture and molecular detection methods.
-Promote preventative practices to minimize pruning wound infections.
-Develop prediction models to improve decision making processes for pruning times and possible treatments.
Link to the presentaiton: “Detection of trunk pathogen inoculum in young vineyards to encourage adoption of preventative practices“