HRV (Holmes ribgrass virus) is a species of Tobamovirus, also known as ribgrass mosaic virus (RMV), Plantago virus, Ribgrass strain of tobacco mosaic virus and Youcai mosaic virus. HRV is an RNA-containing virus with rod-shape particles. It can be found in many wild plant species, this virus not produced serious epidemic diseases, and was the inciting pathogen of a necrotic virus disease in burly tobacco.