Hello Gardeners, I’m Amanda McNulty with Clemson Extension and Making It Grow . A recent caller to the show was concerned about his neighbor’s live oak trees. The leaves were yellowing and they were worried about some shaggy growths appearing on the bark. Fortunately, Tony Melton interpreted the growths as a common gall that appears on some live oak individuals. Many galls are caused by insects, such as tiny wasps and midges, that lay eggs on twigs or buds just as they’re beginning active growth