Hello Gardeners, I’m Amanda McNulty with Clemson Extension and Making It Grow . Like the Cicada Killer wasp, the large European Hornet also collects insects to feed its larvae, a beneficial habit, but sadly it has a destructive activity of girdling twigs. Removing the bark allows the adults to access the nutritious exuding sap and to collect fiber to build its nest. If the twig is completely girdled, the portion above it dies, a condition called flagging, which makes the plant unsightly and you