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)
Cm. Mannion et al., 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), 1994, pp. 837-845
Larvae of Helicoverpa zea (Boddie) fed on a meridic diet containing si
lks of a resistant com genotype, 'Zapalote Chico 2451# (PC3)', were ex
amined as suitable hosts for a larval-pupal parasitoid, Archytas marmo
ratus (Townsend), and a pupal parasitoid, Ichneumon promissorius (Eric
h). Host pupal weight, parasitoid weight, and developmental time were
significantly reduced when host larvae were reared on a diet containin
g resistant silks compared with diet without resistant silks. Weight o
f A. marmoratus was strongly correlated with host weight for both host
diets. Parasitoid developmental time for both parasitoids was also co
rrelated with host pupal weight for hosts fed on a diet containing res
istant silks. Fecundity of both parasitoids was not affected by host d
iet. Adult longevity of I. promissorius was significantly reduced when
reared from hosts fed the diet containing resistant silks compared wi
th hosts reared on the diet without resistant silks. Longevity of fema
le 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 c
ompatible because the negative effects did not result in lower parasit
oid fecundity or increased parasitoid developmental time.