Stock photography picture of White Pieris butterfly on blue aster.

B44294 - Royalty Free Caption White Pieris butterfly on blue aster. Description Pieris, the whites or garden whites, is a widespread genus of butterflies of the family Pieridae. Many species of this genus have caterpillars which feed on cabbage and other members of the Brassicaceae. The chemical basis of this association with a certain plant group has been studied for over 100 years, and is now known to occur via a number of biochemical adaptations to chemicals called glucosinolates in these plants. In contrast to most other insects, Pieris caterpillars are able to detoxify these chemicals, and have become so specialised that they will not eat any food without glucosinolates. The Pieris females, in turn, check for the presence of glucosinolates before laying eggs on a plant. The crop-damaging species have spread from Eurasia to most of the rest of the world and are considered pest insects almost everywhere. Keywords horizontal, white, Pieris, butterfly, alight, on, blue, aster, insect, wing, winged, fall, autumn, nectar, eat, consume, collect