Does Showy Milkweed contain a secret weapon against the Apple Clearwing Moth?

Eby, C., Gardiner, M.G.T., Gries, R., Judd, G.J.R., and Gries, G. (2011). "Does Showy Milkweed contain a secret weapon against the Apple Clearwing Moth?", Professional Pest Management Association of BC, Burnaby BC, Canada, March 28, 2011. (Presentation)