GRBD is a vector-transmitted viral disease of grapevine disease that affects pH, sugar and phenolic accumulation (Blanco-Ulate et al. 2017; Girardello et al. 2019) & ultimately reduces wine quality. Grapevine red blotch virus (GRBV) is the causal agent of Red blotch disease (GRBD).
- Distinguish visual symptoms of grapevine red blotch disease from other vineyard disorders. (PDF 42.18 MB)
- Understand grapevine red blotch disease ecology in English (PDF 7.46 MB) and Spanish (PDF 7.28 MB).
- Learn about important aspects of the disease and its management in Spanish. (PDF 2.06 MB)
- Distinguish between two California treehopper species (PDF 2.82 MB)
- Identify (PDF 374.40 KB) and monitor (PDF 471.89 KB) treehopper girdles in vineyards.
- Understand treehopper girdle trends (PDF 980.65 KB)
- Review the financial considerations for red blotch disease management. (PDF 542.96 KB)
- Understand the challenges of decision-making for grapevine viral diseases. (PDF 530.45 KB)
Check out our Grapevine Red Blotch Disease Visual Identification Training Tool to gain experience differentiating red blotch disease from Leafroll, spider mites, and potassium deficiency.
This tool was designed to test the ability of visual symptom identification and is intended as a learning tool for those who visually assess symptoms in the vineyard. Molecular diagnostic assays should always be used to confirm visual assessments. If you use assistive technology and would like more information on this tool, please contact anraccessibility@ucanr.edu for assistance.