The
scale develops on the trunk, limbs and twigs and occasionally
on the fruit of such trees as apple, apricots, peach, pear,
plum and a great variety of introduced trees and shrubs. The
scale covers an irregular circle about 1.5cm diameter. It is
greyish in colour with a dark area in the centre.
Spray
at dormant stage prior to bud swell and during growing season.
