Feeding, colonization and impact of the cinnabar moth, Tyria jacobaeae, on Senecio triangularis, a novel, native host plant Public Deposited

http://ir.library.oregonstate.edu/concern/graduate_thesis_or_dissertations/3b591c221

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  • I conducted field and laboratory studies to determine the impact of the cinnabar moth, Tvria jacobaeae L., on the native perennial herb, Senecio triangularis Hook. The cinnabar moth was introduced into Oregon in 1960 to control the noxious weed Senecio jacobaea L. and is now well established on both the native plant and the weed in Oregon. My objectives were to determine the suitability of S. triangularis as a diet for the cinnabar moth, to estimate the frequency with which the moths colonize the native plant in the field, and to estimate the impact of larval feeding on the plant's survivorship and reproduction. Larvae successfully completed development on S. triangularis, but development time was longer, growth was slower, and pupae were lighter compared to performance on S. jacobaea. Cinnabar moth colonization and feeding damage were concentrated at one of the four study sites observed. Cinnabar moth defoliation results in a 3.9% reduction in seed viability and is inversely related to damage to seeds by native insects. I conclude that cinnabar moths commonly discover this native plant in the field, can establish and develop on it, and cause a small reduction in plant reproductive success.
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