title: Effects of virus concentration and ultraviolet irradiation on the activity of corn earworm and beet armyworm (Lepidoptera: Noctuidae) nucleopolyhedroviruses.
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).
authors.affiliation: Insect Biocontrol Laboratory, USDA-ARS, Henry A. Wallace Agricultural Research Center, Beltsville, MD 20705, USA. shapirom@ba.ars.usda.gov
authors.forename: Martin
authors.initials: M
authors.lastname: Shapiro
authors.forename: Robert R
authors.initials: RR
authors.lastname: Farrar
authors.forename: John
authors.initials: J
authors.lastname: Domek
authors.forename: Iqbal
authors.initials: I
authors.lastname: Javaid
mesh_terms: D000818:Animals; D009036:Moths / Q000821:virology*; D017924:Nucleopolyhedroviruses / Q000502:physiology / Q000528:radiation effects*; D010572:Pest Control, Biological / Q000379:methods; D011829:Radiation Dosage; D018411:Spodoptera / Q000821:virology*; D014466:Ultraviolet Rays