This OP explains how to use grafting – a technique whereby cut tissue surfaces of different plants are placed in close contact to effect a union. Grafting is considered to be a universal method for transmitting viruses, because grafting can transmit systemic viruses. Some grafts, however, are easier to do than others. Grafting is particularly useful for transmission of phloem-restricted viruses that cannot be transmitted mechanically and viruses whose vectors remain unknown, and for detecting viruses found in low concentrations.