Centaurea cyanus
The larvae feed on "Calendula arvensis", "Calendula officinalis", "Callistephus chinensis", "Centaurea cyanus", "Dahlia pinnata", "Emilia flammea", "Erigeron canadensis", "Erigeron linifolius", "Helichrysum bracteatum" and "Senecio cruentus". They bore into the flower-bud, flower, terminal end of the stem or the fork of the stem of the host plant. When the larva bores into the stem, it makes a tunnel. The larva pupates within the stem or flower.