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Updated: May 5, 2026
Non-Aqueous Isolation and Enrichment of Glandular Capitate Stalked and Sessile Trichomes from Cannabis sativa
Published on: May 12, 2023
Analysis of trichome exudate from mite-resistant geraniums
D L Gerhold1, R Craig, R O Mumma
1Pesticide Research Laboratory and Graduate Study Center, Departments of Entomology and Horticulture, The Pennsylvania State University, 16802, University Park, Pennsylvania.
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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