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). Spissistilus festinus (TCAH) and Tortistilus wickhami (Tortistilus) are two treehoppers found in California vineyards. S. festinus is a vector of grapevine red blotch virus. T. wickhami is under investigation as a vector.
GRBD Symptom Identification
- Learn about visual symptoms of grapevine red blotch disease. (PDF 42.18 MB)
- Review the differences between Grapevine leafroll disease and Grapevine red blotch disease (PDF 1.62 MB)
Learn about GRBD vector ecology
- 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)
Making GRBD management decisions
- Understand GRBD ecology and management strategies in English (PDF 7.46 MB) and Spanish (PDF 7.28 MB).
- Review the financial considerations for RBD management. (PDF 542.96 KB)
- Understand the challenges of decision-making for grapevine viral diseases. (PDF 530.45 KB)
- Learn about barrier plantings in vineyards and how they can be beneficial to local ecology and agroecosystems (PDF 1.17MB)
- Learn about important aspects GRBD and its management in Spanish. (PDF 2.06 MB)
GRBD Training Tool
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.