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  • Title: Analysis of trichome exudate from mite-resistant geraniums.
    Author: Gerhold DL, Craig R, Mumma RO.
    Journal: J Chem Ecol; 1984 May; 10(5):713-22. PubMed ID: 24318735.
    Abstract:
    Trichome exudate from mite-resistant geraniums (Pelargonium horlorum) was analyzed, principally by mass spectrometry and NMR spectroscopy. The exudate was found to consist of two anacardic acid derivatives,o-pentadecenylsalicylic acid ando-heptadecenylsalicylic acid. Bioassays established a moderate toxicity of these compounds to the two-spotted spider mite,Tetranychus urticae. The production of these compounds in geraniums was correlated with the two complementary dominant genes previously reported for host resistance to spider mites.
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