RT-LAMP assay for detection of Grapevine rupestris stem pitting-associated virus Genetic variation analysis of the coat protein of Grapevine rupestris stem pitting associated virus isolates from China Using RT-PCR Assay to Detect Grapevine rupestris stem pitting associated virus Based on Internal Control Using RT-PCR Assay to Detect Grapevine rupestris stem pitting associated virus Based on Internal Control Multiplex RT-PCR for Simultaneous Detection of Four Grapevine Viruses Multiplex RT-PCR for Simultaneous Detection of Four Grapevine Viruses