Field evaluation of insect resistance in a wild tomato and its effects on insect parasitoids |
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| Authors: | R R Farrar J D Barbour and G G Kennedy |
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| Institution: | (1) Department of Entomology, North Carolina State University, 27695-7630 Raleigh, NC, USA;(2) Present address: USDA-ARS-IBL, Bldg. 402, BARC-East, 20705 Beltsville, MD, USA;(3) Present address: Dept. of Entomology, Louisiana State University, 402 Life Science Bldg., 70803 Baton Rouge, LA, USA |
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| Abstract: | Populations ofHelicoverpa (=Heliothis) zea (Boddie),Heliothis virescens (F.),Manduca sexta (L.) andM. 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 ofH. zea andH. 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 ofManduca spp. larvae were too low to permit similar analyses of the effects of plant genotype. Rates of egg parasitism byTrichogramma spp. andTelenomus sphingis (Ashmead) were reduced on insect-resistant genotypes. Rates of parasitism by the larval parasitoidsCampoletis sonorensis (Cameron) andCotesia congregata (Say) were reduced on resistant genotypes. No consistent effects on parasitism rates byCotesia marginiventris (Cresson) were observed and parasitism rates byCardiochiles nigriceps Viereck were unaffected. |
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