T-bud grafting of grapevines

First Paragraph: A fast, easy, foolproof method is needed for topworking fruiting grapevines to a better variety high above ground level (that is, just below the bottom trellis wire). High-level grafting with the bark graft or the wedge graft requires time, considerable skill, and two more applications off a good grafting compound. Usually, less than 90 percent of the grafts take.