In contrast, spots of C. stigma tend to be more orange-yellow, round and oriented more toward the head of the beetle. Habitat Vegetation that is attacked by scales. Pests attacked In North America., euonymus scales and other scales, such as the San Jose scale. In China, Korea and Japan, where it is common, C. kuwanae helps to keep several species of armored scales under control in citrus groves and on landscape shrubs. Life cycle Beetles spend the winter as adults in leaf litter at the base of scale-infested plants.
Adults lay bright orange eggs, singly or in small groups under the scale covers.
Eggs hatch into brown larvae covered with black spines. Larvae will flip over or chew through scale covers to feed on the fleshy scale body. After 3 larval stages, larvae move to the underside of a leaf or to a crack or crevice on a twig or branch. There they become immobile and the larval skins split to form pupae. In the laboratory, it takes about a month to mature from egg to adult.