Potential of Bonnetia comta (Diptera: Tachinidae) in Combination With a Nuclear Polyhedrosis Virus to Control Agrotis ipsilon (Lepidoptera: Noctuidae) Larvae on Corn 1

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Abstract
Impact of a nuclear polyhedrosis virus from Rachiplusia ou (Guenée) (Ro M NPV) on Bonnetia comta (Fallén) developing within infected black cutworm (BCW), Agrotis ipsilon (Hufnagel), larvae was examined. The Ro M NPV had no evident detrimental effect on the tachinid maggots, except indirectly when the virus killed the hosts before the parasitoids were able to emerge. The Ro M NPV polyhedral inclusion bodies were found primarily in the gut lumens of B. comta maggots within infected BCW larvae. Greenhouse and field studies were conducted to test the potential of B. comta in combination with the Ro M NPV to reduce BCW larvae on seedling corn. In the greenhouse, both the B. comta planidia alone and in combination with Ro M NPV on a bran bait significantly reduced the percentage of seedling corn cut by third-instar BCW; in the field, only the parasitoid and virus in combination resulted in significant reduction.

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