Origin:
Native to North America
Biology:
The scale is unique to conifers, producing large quantities of white, fluffy wax during late spring to early summer. When infestations are heavy the tree appears covered with snow. The scales concentrate at the ends of branches and along the base of needles. They have the potential to cause severe yellowing of needles and dieback of infested branches.
Identification:
Associated only with various species of pines, the adult female scale is about 2 mm long, somewhat circular or oval in shape, and greenish brown. However, the copious production of white wax usually covers the scales completely as the infestation matures.
Characteristicts Important to Control:
Trees under stress from environmental conditions seem most susceptible to the scale, so promoting good tree health in a landscape setting will prevent problems. Where populations of the scale warrant control dormant or summer oils may be effective, as well as contact insecticides applied when the first instar crawlers are present. An IGR applied when crawlers are present also may be effective.
