[1] C. bifasciata is a parasite of the red scale (Aonidiella aurantii), a major insect pest of citrus.

This pest was accidentally brought into the United States in the second half of the nineteenth century, and is known there as California red scale.

[2] In attempts to try to control the red scale, in 1908 Comperiella bifasciata, and two other parasitic wasps, were introduced into California from Japan.

When imports of a different biological race were made from China between 1947 and 1949, the parasite did become established on red scale in California.

The mummified corpse of the scale insect, with black meconium deposits inside, usually remains stuck to the host plant.