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
Daniel Lawrence
Objectives are:
-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“
Vicken Hillis, Mark Lubell, and Kendra Baumgartner
This research is a broad effort to understand grower decision making in the context of trunk disease management.” A presentation on a research survey to identify hurdles in which farm managers, consultants, and the like, face when adoption of new management practices may be necessary.
Link to the presentation: “Identifying Sociological Hurdles to Adoption of Trunk Disease Management Practices“
Renaud Travadon & Kendra Baumgartner
Developing rapid grapevine screening process to identify wine and table grape cultivars for resistance to Eutypa Dieback based on foliar and woody symptoms. Future efforts towards comparing gene expression profile between previously characterized resistance and susceptible cultivars.
Based on previously discovered Phomopsis resistant genes, determine if woody tissue resistant genes can be linked to green tissue symptom expression.
Determine how anatomical and chemical differences effect Botryosphaeria resistance levels in 7 table grape cultivars.
Link to the presentation: “Baumgartner and Travadon presentation for the board meeting 2014”
Goal – Identify new anatomical and biochemical markers of resistance in grapevine wood.
Activities – Characterize changes in the wood that correspond to resistance to Eutypa dieback, using cultivars with known resistance/tolerance: Merlot (resistant), Cabernet Sauvignon (intermediate), and Thompson seedless (susceptible).
Results & Outputs – Identified differences in cell wall and xylem characteristics. Susceptible tablegrape Thompson seedless had low lignin and high glucan in its cell walls, whereas resistant winegrape Merlot had high lignin and low glucan (Cabernet Sauvignon was intermediate). Xylem vessel diameter also differed between these two cultivars; Thompson seedless had the largest vessels and Merlot had the smallest.
Significant Outcomes & Impacts – These markers of Eutypa resistance will compliment the detached-cane screening method, to provide additional measures of resistance. This is important because we are evaluating genetically-diverse germplasm, which may exhibit different modes of resistance. These markers are now being evaluated for the other trunk diseases (Botryosphaeria dieback, Esca, Phomopsis dieback), along with the detached-cane method of screening.
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