Toxicity of peppermint monoterpenes to the variegated cutworm, Peridroma saucia Hübner Public Deposited

http://ir.library.oregonstate.edu/concern/graduate_thesis_or_dissertations/th83m241v

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  • The toxicity of menthol, menthone, pulegone, limonene, and a-pinene, five monoterpenes found in peppermint (Mentha piperita L.), to the variegated cutworm (Peridroma saucia Hiibner) was characterized by in vivo and in vitro methods. Pulegone and menthone caused slower growth over six days when incorporated into an artificial diet and fed to fifth stadium larvae. Reduced growth was likely the result of the significant antifeedant properties observed for these compounds. Menthol, the dominant monoterpene found in peppermint leaves caused molting and pupation inhibition when incorporated in the diet over the dosage range comparable to that found in planta (0.05% to 0.2%). Limonene at a dose of 0.2% caused significant inhibition of pupation, but otherwise had little effect on growth or survival. a-Pinene had no effect on pupation, growth or survival over a dosage range of 0.05% to 0.2%. All five monoterpenes were metabolized in vitro by the cytochrome P-450 dependent polysubstrate oxidase system, however piperonyl butoxide did not synergize their toxicity in vivo. Neonate larvae were more sensitive to oral administration of these monoterpenes than were fifth stadium larvae. These experiments suggest that monoterpenes in peppermint leaves could cause mortality to neonate variegated cutworm larvae.
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