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1 December 2005 Virulence of a Nucleopolyhedrovirus to Neodiprion abietis (Hymenoptera: Diprionidae)
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Abstract

Different larval stages of balsam fir sawfly, Neodiprion 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 on 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.

S. Y. Li "Virulence of a Nucleopolyhedrovirus to Neodiprion abietis (Hymenoptera: Diprionidae)," Journal of Economic Entomology 98(6), (1 December 2005). https://doi.org/10.1603/0022-0493-98.6.1870
Received: 30 December 2004; Accepted: 1 July 2005; Published: 1 December 2005
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