SESQUITEPENOID ACIDS DETER MITE COLONIZATION OF THE TOMATO RELATIVE, LYCOPERSICON HIRSUTUM

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  • 1 Department of Horticulture and Landscape Architecture, N318 Ag. Sci. N., University of Kentucky
  • 2 Life Sciences Mass Spectrometry Facility, College of Pharmacy, University of Kentucky, Lexington, KY 40546

Spider mites (Tetranychus urticae Koch) readily colonize the cultivated tomato. Lycopersicon esculentum L. However, mites have extreme difficulty colonizing the wild relative of tomato, L. hirsutum Humb. and Bonpl. When mites approach leaves of L. hirsutum, they often veer away, suggesting the presence of a deterrent or repellent. Initial experiments indicated that trichome secretions on leaflets of L. hirstum deterred mites. In vitro bioassays indicated that at least four distinct compounds present in these sequiterpenoid secretions of L. hirsutum P.I. 251303 were deterrent. At least two of the compounds were soluble in dilute NaOH. Based on mass spectra and 1H and 13C NMR the structure of two base soluble compounds were established as two related bisabolane derived carboxylic acids.

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