What do they look like? Irregular shaped lumps on the leaves and young stems of Eucalypts, young trees tend be affected more often than established trees. These lumps, which may resemble warts often vary in shape and colour depending on the species they are growing on. The adult is a tiny winged insect which is rarely seen.
What do they do? Suck the sap out of leaves and stems, the feeding stimulates plant cells to produce the gall. The gall eventually completely surrounds the adults, producing the lumpy growths.
Control Spraying is not effective and is usually un-necessary, water and fertilise affected tree to stimulate vigorous growth.