University of Illinois Extension
University of Illinois Extension - Selecting Trees for Your Home
Pine Tortoise Scale
Toumeyella parvicrnis
Sooty mold grows on insect honeydew.
Severity: 3 out of 5
Frequency: 2 out of 5
Symptoms: Heavy feeding by this insect on pines produces sufficient honeydew for the sooty mold fungi to grow on. Sooty mold will turn the plant black.
Cycle: Crawlers occur in late June and July. The adult female may produce 500 crawlers. The adult males can fly but not feed. This scale has only one generation per year and prefers young trees to older trees.
Management: If necessary use a recommended insecticide. Spray when Vanhoutte spirea is blooming. A second spray is needed when Hills of Snow Hydrangea blooms are turning from green to white and a third spray 7 to 10 days after the 2nd spray. A summer oil may discolor the needles.
Associated trees: