Effects of Virus Concentration and Ultraviolet Irradiation on the Activity of Corn Earworm and Beet Armyworm (Lepidoptera: Noctuidae) Nucleopolyhedroviruses

Martin Shapiro; Robert R. Farrar Jr; John Domek; Iqbal Javaid

doi:10.1603/0022-0493-95.2.243

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Martin Shapiro,^1,2 Robert R. Farrar Jr,¹ John Domek,¹ Iqbal Javaid³

¹Insect Biocontrol Laboratory, USDA-ARS, Henry A. Wallace Agricultural Research Center, Beltsville, MD 20705
²shapirom@ba.ars.usda.gov
³University of Maryland, Eastern Shore, Princess Anne, MD 21853

Abstract

Laboratory studies were initiated to determine the relationship between virus concentration and radiation-caused inactivation of NPVs from Helicoverpa zea (HzSNPV) and Spodoptera exigua (SeMNPV). In the laboratory, a UV-B/UV-A system was used for inactivation studies. For both viruses inactivation was dependent upon both length of UV exposure and virus concentration. At all virus concentrations HzSNPV was more sensitive to UV than SeMNPV. In the field HzSNPV was used and virus persistence was significantly affected by virus concentration (i.e., inactivation was inversely related to virus concentration).

Citation Download Citation

Martin Shapiro, Robert R. Farrar Jr, John Domek, and Iqbal Javaid "Effects of Virus Concentration and Ultraviolet Irradiation on the Activity of Corn Earworm and Beet Armyworm (Lepidoptera: Noctuidae) Nucleopolyhedroviruses," Journal of Economic Entomology 95(2), 243-249, (1 April 2002). https://doi.org/10.1603/0022-0493-95.2.243

Received: 22 November 2000; Accepted: 1 November 2001; Published: 1 April 2002