Attacks cabbage, collards, greenhouse plants, and some ornamentals such as alyssum, candytuft, and wallflower. Imported from Europe, this insect now occurs all over the U.S.
It usually devours only a small portion of leaf. Larvae work on the underside and eat many small holes. Frequently they leave only the upper epidermis, which has an isinglass-like effect.
It gets its name from a row of diamond-shaped yellow spots which meet down the back of the moth. The moths spend the winter hidden among crop remnants. The larvae seldom exceed one-third inch in length, are pale green in color, and are much more nervous in habit than other cabbage worms.
