Following the identification in 2012 of Grapevine Red Blotch-associated Virus (GRBaV), substantial efforts have been made to investigate the occurrence and spread of the disease in Oregon vineyards.  Leaf collections were made in the fall of 2013-2015, nucleic acid extracts were obtained, and PCR methodologies were applied to detect presence or absence of GRBaV in collected materials.  Sticky cards and sweep net samples were collected to capture potential insect vector species.  Distribution of insects and virus-infected vines were assessed using a spatial analysis statistical program and visually plotted using a contour-mapping program.  Our studies have allowed us to determine: 1) baseline incidence of GRBaV in select Oregon vineyards; 2) confirm GRBaV is spread in these sites; 3) potential insect vectors that may be present in Oregon vineyards.  PCR analysis showed that GRBaV is present in most surveyed vineyards and appears to be spreading rapidly in some locations.  Several candidate vector species of leafhoppers were present in the sticky cards or sweep net samples.  Studies are ongoing to confirm whether any of the collected insect species can transmit GRBaV.