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The pathogenicity of grapevine geminivirus A (GGVA), a recently identified DNA virus, to grapevine plants remains largely unclear. Here, we report a new GGVA isolate (named GGVA^QN) obtained from grapevine ‘Queen Nina’ plants with severe disease symptoms. The infectious clone of GGVA^QN (pXT-GGVA^QN) was constructed to investigate its pathogenicity. <i>Nicotiana benthamiana</i> plants inoculated with GGVA^QN by agroinfiltration displayed upward leaf curling and chlorotic mottling symptoms. A simple, quick, and efficient method for delivering DNA clones of GGVA^QN into grapevine plants was developed, by which <i>Agrobacterium tumefaciens</i> cells carrying pXT-GGVA^QN were introduced into the roots of in vitro-grown ‘Red Globe’ grape plantlets with a syringe. By this method, all ‘Red Globe’ grape plants were systemically infected with GGVA^QN, and the plants exhibited chlorotic mottling symptoms on their upper leaves and downward curling, interveinal yellowing, and leaf-margin necrosis symptoms on their lower leaves. Our results provide insights into the pathogenicity of GGVA and a simple and efficient inoculation method to deliver infectious viral clones to woody perennial plants.