University of Illinois Extension
University of Illinois Extension - Selecting Trees for Your Home
Pine Needle Scale
Phenacaspis pinifoliae
Severity: 4 out of 5
Frequency: 2 out of 5
Symptoms: As the number of insects increase, the tree often looks like it has been "flocked" in the summer. In addition, the amount of damage increases. Left alone, the insects will kill the tree.
Cycle: Pine needle scale overwinters as reddish eggs under the dead female body cover. Eggs hatch during candle growth. The crawlers move onto the new needles on the same tree or they may be carried or blown onto another tree. In the midwest, one life cycle occurs per year. In other parts of the country, two life cycles may occur in one growing season.
Management: Correct timing with insecticidal sprays can eliminate this insect. Because it overwinters as eggs, dormant oil spray does not provide effective control.
Associated trees: