title: Analysis of trichome exudate from mite-resistant geraniums.
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.
authors: Pesticide Research Laboratory and Graduate Study Center, Departments of Entomology and Horticulture, The Pennsylvania State University, 16802, University Park, Pennsylvania.
authors: D L
authors: DL
authors: Gerhold
authors: R
authors: R
authors: Craig
authors: R O
authors: RO
authors: Mumma