Environmental Entomology (1994) 23, 837-845

C.M. Mannion, J.E. Carpenter, B.R. Wiseman and H.R. Gross (1994)
Host corn earworm (Lepidoptera: Noctuidae) reared on meridic diet containing silks from a resistant corn genotype on Archytas marmoratus (Diptera: Tachinidae) and Ichneumon promissorius (Hymenoptera: Ichneumonidae)
Environmental Entomology 23 (4), 837-845
Abstract: Larvae of Helicoverpa zea (Boddie) fed on a meridic diet containing silks of a resistant corn genotype, 'Zapalote Chico 2451# (PC3)', were examined as suitable hosts for a larval-pupal parasitoid, Archytas marmoratus (Townsend), and a pupal parasitoid, Ichneumon promissorius (Erich). Host pupal weight, parasitoid weight, and developmental time were significantly reduced when host larvae were reared on a diet containing resistant silks compared with diet without resistant silks. Weight of A. marmoratus was strongly correlated with host weight for both host diets. Parasitoid developmental time for both parasitoids was also correlated with host pupal weight for hosts fed on a diet containing resistant silks. Fecundity of both parasitoids was not affected by host diet. Adult longevity of I. promissorius was significantly reduced when reared from hosts fed the diet containing resistant silks compared with hosts reared on the diet without resistant silks. Longevity of female A. marmoratus was not affected by host diet, but male A. marmoratus lived longer when reared from hosts fed the resistant diet. Despite a few negative effects (lower percentage emergence of A. marmoratus) of a resistant host diet on the parasitoids, these strategies could be compatible because the negative effects did not result in lower parasitoid fecundity or increased parasitoid developmental time.
(The abstract is excluded from the Creative Commons licence and has been copied with permission by the publisher.)
Database assignments for author(s): Catharine M. Mannion, James E. Carpenter

Research topic(s) for pests/diseases/weeds:
resistance/tolerance/defence of host
biocontrol - natural enemies
Research topic(s) for beneficials or antagonists:
environment/habitat manipulation
general biology - morphology - evolution

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Pest and/or beneficial records:

Beneficial	Pest/Disease/Weed	Crop/Product	Country	Quarant.
	Helicoverpa zea	Maize/corn (Zea mays)
Archytas marmoratus (parasitoid)	Helicoverpa zea
Ichneumon promissorius (parasitoid)	Helicoverpa zea