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Resistance in wild tomatoes to larvae of a specialist herbivore, Keiferia lycopersicella

Delayed larval development, higher mortality, and reduced leaf consumption by the tomato pinworm, Keiferia lycopersicella (Walsingham) (Lepidoptera: Gelechiidae), were observed on two related wild tomatoes, Lycopersicon hirsutum Humb. & Bonpl. (LA 361) and L. hirsutum f. glabratum C. M. Mull (PI 134417), when compared with the commercial variety, L. esculentum cv. VFN 7718. The exudate of type VI trichomes of these wild accessions provided significant antibiotic effects against the first larval instar of K. lycopersicella: 95–97.5% mortality occurred on foliage with the trichomes intact, versus 5.6–30% mortality on foliage where trichome heads were removed. Basal cells of type VI trichomes and other epidermal cells as well as most of the palisade mesophyll cells of L. hirsutum f. glabratum, were not consumed by K lycopersicella larvae, suggesting these structures also contain deterrent chemicals. Similar results were not evident for L. esculentum and L. hirsutum.