Ralph, you need to check where that sprout is emanating from. If it is from below the graft line, it is coming from the rootstock, and not the variety scionwood (what is above the graft line is the Meyer variety scionwood.) If it's coming from below the graft line, cut that sprout off right at the trunk. If you can provide photos, especially a nice close up photo of the trunk where the sprout is coming from, and try to give us what you think if the graft line in the photo, we can help you better. A photo is worth a thousand words, as they say :-)

Patty S.