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Field evaluation of insect resistance in a wild tomato and its effects on insect parasitoids

Author:
Kennedy, G.G., Farrar, R.R. Jr., Barbour, J.D.
Source:
Entomologia experimentalis et applicata 1994 v.71 no.3 pp. 211-226
ISSN:
0013-8703
Subject:
Campoletis sonorensis, Cardiochiles nigriceps, Cotesia congregata, Cotesia marginiventris, Helicoverpa zea, Heliothis virescens, Manduca quinquemaculata, Manduca sexta, Solanum habrochaites, Telenomus, Trichogramma, backcrossing, cultivars, eggs, genotype, hybrids, insects, larvae, parasitism, parasitoids, pest resistance, progeny, tomatoes, wild relatives
Abstract:
Populations of Helicoverpa (= Heliothis) zea (Boddie), Heliothis virescens (F.), Manduca sexta (L.) and M. quinquemaculata (Haw.) and their egg and larval parasitoids were sampled in field plots of the: insect-resistant wild tomato, Lycopersicon hirsutum f. glabratum C. H. Mull, accession PI 134417; susceptible commercial tomato cultivar ‘Better Boy' F₁ hybrid; and selected, moderately resistant backcross genotype. Densities of H. zea and H. virescens eggs and small larvae were higher on resistant genotypes than on susceptible genotypes, but densities of large larvae were similar on all genotypes. Densities of Manduca spp. larvae were too low to permit similar analyses of the effects of plant genotype. Rates of egg parasitism by Trichogramma spp. and Telenomus sphingis (Ashmead) were reduced on insect-resistant genotypes. Rates of parasitism by the larval parasitoids Campoletis sonorensis (Cameron) and Cotesia congregata (Say) were reduced on resistant genotypes. No consistent effects on parasitism rates by Cotesia marginiventris (Cresson) were observed and parasitism rates by Cardiochiles nigriceps Viereck were unaffected.
Agid:
128742