ESTABLISHMENT IN CANADA OF THE CINNABAR MOTH, TYRIA JACOBAEAE (LEPIDOPTERA: ARCTIIDAE) FOR CONTROLLING THE WEED SENECIO JACOBAEA

Abstract
The cinnabar moth, Tyria jacobaeae L., was established in the Atlantic provinces and British Columbia for the control of tansy ragwort. Establishment was difficult to obtain with imported stock: only two of 14 colonies survived, one on each coast. The rate of survival in these colonies increased with succeeding generations, and with stock from the regional colony eight of nine releases became established in Nova Scotia. Most of the established colonies increased until the ragwort was defoliated.