This scale prefers hemlock, fir and pine and rarely feeds on Cryptomeria in the U.S. Look for discolored needles showing yellowish blotches. Then turn the needles over to find the yellow crawlers and scale covers. Sprays are warranted if the infestation is moderate to heavy, damage is objectionable, and there is little evidence of parasite activity. Look for a second generation in August. Eggs are deposited on needles, resulting in neat rows of clear to yellow spots.
Heavy infestations can defoliate and kill small pines.
Manually remove and destroy larvae in light infestations. For heavy infestations, spray with hort oil if larvae are small. Use a residual insecticide if you don't catch this pest until the larvae are large. A second generation will occur with larvae hatching in October. Locust leafminer is the leafmining beetle that devastates black locust along the highway, leaving trees with a scorched appearance.