Submitted to: United States Department of Agricultural Interagency Gypsy Moth Research Forum
Publication Type: Abstract Only
Publication Acceptance Date: March 30, 2000
Publication Date: N/A
We used a bugs-in-bags approach to confirm a laboratory finding that the co-application of Helicoverpa armigera granulosis virus (HaGV) with Gypchek (LdMNPV) increased viral mortality at a given dose compared to that resulting from Gypchek applied alone. We applied Gypchek and the granulosis virus in various combinations against several gypsy moth instars under field conditions (with a Blankophor BBH + Gypchek treatment included as a comparison of virus enhancers), and determined the residual effects of the treatments over a 3-wk period. The addition of HaGV at 1% to Gypchek resulted in a log increase in observed mortality, confirming the laboratory finding of such potentiation. The addition of Blankophor BBH at 1% resulted in a two-log increase in observed mortality. The addition of HaGV at a lower dose of 0.1% resulted in no consistent increase in recorded mortality, and 1% granulosis virus applied alone was inactive against gypsy moth. The residual activity of Gypchek was little enhanced by the addition of the granulosis virus at either dose.