Crawlers tend to settle close together, resulting in patches of scales several layers deep. This is a serious pest which causes dieback of branches, limbs, and sometimes entire trees. Oaks, especially pin oak, are the primary host, but it has also been reported on chestnut, pecan, beech, English walnut, willow, maple, hickory, and other trees. Juniper Scale Females are round and dirty-white with yellow centers. Under a magnifying glass they resemble miniature fried eggs.
Males are also white, but smaller and narrower.
Hosts include junipers, arborvitae, incense cedar, and cypress. There are two generations annually. Japanese Scale Mature scales are grayish white, long, and narrow. Japanese scale is a pest of maple, privet, boxwood, holly, Japanese quince, and rose. On ferns, African violet, begonia, camellia, citrus, fig, geranium, hibiscus, liriope, orchids, palms, violet, and many others.