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Tortistilus and Spissistilus are two genera of cryptic treehoppers from the Ceresini tribe. S. festinus is a vector of grapevine red blotch virus (GRBV) in vineyards in northern California, USA; however, the transmission capabilities of Tortistilus spp. are unknown. In this study, we determined the species of Tortistilus found in vineyards in Napa Valley, California, as T. wickhami, and determined that only a few specimens but no dissected heads with salivary glands tested positive for GRBV in PCR and qPCR. These results suggested that T. wickhami is an unlikely vector of GRBV in northern California vineyards.