Mortality and inhibition of Egg parasitism rates by in relation to trichome/methyl ketone-mediated insect resistance of, accession PI 134417

The glandular trichome/methyl ketone-mediated insect resistance of the wild tomato, C.H. Mull, accession PI 134417, to (L.) and (Say) was shown to affect adversely Riley. Adult were killed by direct contact with PI 134417 foliage and by exposure to its volatiles. This effect was greatly reduced or eliminated by removing the exudate of the glandular trichomes from the foliage. 2-Tridecanone, a principal consituent of the foliar glandular trichomes of PI 134417, was toxic to adult at concentrations similar to those associated with PI 134417 foliage. Incubation of parasitized (Boddie) eggs on PI 134417 foliage or 2-tridecanone-treated filter paper significantly reduced the proportion of eggs producing adult parasitoids. Similarly, incubation of parasitized eggs on filter paper treated with 2-undecanone, another constituent of the glandular trichomes of PI 134417, caused an increase in the percentage of host eggs containing dead parasitoid pupae.