Environmental Entomology (2002) 31, 482-489

Thomas P. Kuhar, Mark G. Wright, Michael P. Hoffmann and Sylvie A. Chenus (2002)
Life table studies of European corn borer (Lepidoptera: Crambidae) with and without inoculative releases of Trichogramma ostriniae (Hymenoptera: Trichogrammatidae)
Environmental Entomology 31 (3), 482-489
Abstract: Life table studies of European corn borer, Ostrinia nubilalis (Hübner), populations with and without inoculative releases of Trichogramma ostriniae (Peng and Chen) were conducted in sweet corn and field corn. Inoculative releases of T. ostriniae (at 72,000 females per hectare) provided relatively high parasitism of European corn borer eggs (~37%) throughout the season. The increase in egg parasitism was not offset by compensatory changes in other mortality rates such as egg predation, eggs not hatching, and death of early instars after egg hatch. Early instar disappearance was a key mortality factor accounting for >70% of total mortality from egg deposition to established larvae. Egg parasitism by T. ostriniae was also a key mortality factor. Releases of T. ostriniae increased total egg and larval mortality of O. nubilalis from 61 to 92% in sweet corn and from 80 to 93% in field corn.
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Database assignments for author(s): Thomas P. Kuhar, Mark G. Wright

Research topic(s) for pests/diseases/weeds:
biocontrol - natural enemies
population dynamics/ epidemiology
Research topic(s) for beneficials or antagonists:
population dynamics/epizootiology
inundative/inoculative release

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Pest and/or beneficial records:

Beneficial	Pest/Disease/Weed	Crop/Product	Country	Quarant.
	Ostrinia nubilalis	Maize/corn (Zea mays)	U.S.A. (NE)
Trichogramma ostriniae (parasitoid)	Ostrinia nubilalis	Maize/corn (Zea mays)	U.S.A. (NE)