A large scale insect that is seen in quantity attached to twigs and branches. The most common of these is the European fruit lecanium scale. These scales suck the sap from leaves during late July and August and from twigs during May and June of the following year. The young scales collectively produce a great quantity of honeydew, which in turn causes sooty mold to form on the tree and on cars, etc. underneath. If not controlled, they can cause decline in the tree’s general health. Spray treatments are very effective if timed for the crawler stage.