Hosts
Pine tortoise scale attacks mainly Scots and Jack pine. It can also be found on Austrian and red pines.
Pine Tortoise Scale
Pathogen Type
Scientific Name
Toumeyella parvicrnis
Frequency
2
Severity
3
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.
Credit
James E. Schuster, retired Extension Specialist, Horticulture & Plant Pathology and Dr. Philip L. Nixon, Extension Entomologist, Crop Sciences, University of Illinois
PathogenID
73
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