European elm scale (EES) is a pest that normally attacks fruit and ornamental trees.
Controlling Elm Scale
There are several ways we can control elm scale populations. Early and late season control involves applying dormant or horticultural oil in order to suffocate active nymphs. Early season control is applied shortly after tree bud-break, prior to the production of elm scale adults and crawlers. Late season control is undertaken just prior to leaf drop as nymphs move back to the branches. During peak crawler numbers, applying a soap and permethrin mix known as Trounce® will significantly reduce crawler numbers.