Canadian Forest Service Publications
Virulence of a Nucleopolyhedrovirus to Neodriprion abietis (Hymenoptera: Diprionidae). 2005. Li, S.Y. Entomological Society of America 98(6): 1870-1875.
Issued by: National Capital Region
Catalog ID: 25992
Different larval stages of balsam fir sawfly, Neodriprion abietis (Harris) (Hymenoptera: Diprionidae), were challenged by different concentrations of a nucleopolyhedrovirus in the laboratory to determine larval susceptibility to the virus and to test treatment effects of the virus on the sawfly survivors. The results indicated that younger larvae were more susceptible to the virus than older instars. The speed of larval death depended on the larval age and the virus concentration. Generally, the virus killed second or third instars in 5 d and fourth or fifth instars in 10-12 d at concentrations of 107 polyhedral inclusion bodies (PIB) / ml. The virus had profound treatment effects of sawfly survivors. Feeding activity of the survivors was reduced by >40% compared with that of the control group, pupal weight by 25%, and adult emergence by >30%. There was also a higher percentage of male adults in the virus-treated groups than in the control.