Canadian Forest Service Publications

Effects of long-term storage on potency of TM Biocontrol-1, the registered viral insecticide of Orgyia pseudotsugata (Lepidoptera: Lymantriidae) 2006. Otvos, I.S.; Kukan, B.; Reardon, R.; Ragenovich, I. Journal of Economic Entomology 99(1): 14-22.

Year: 2006

Issued by: Pacific Forestry Centre

Catalog ID: 26234

Language: English

Availability: PDF (request by e-mail)

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Abstract

The article presents the results of bioassaying 39 samples of TM Biocontrol-1, a viral insecticide, from 10 different lots and various sizes of vacuum-sealed packages that were stored at 10C for 5-15 yr. This is the first study to present potency data for a registered virus product stored for this length of time. Laboratory bioassays in insects from the same colony from which the TM Biocontrol-1 was produced showed that the stored viral insecticide is still effective, although it lost about 30% of its effectiveness during storage. A direct correlation of this loss with the length of time in storage is not apparent. Bioassays also showed that there are significant differences in the susceptibility of Douglas-fir tussock moth, Orgyia pseudotsugata (McDunnough), larvae from different geographic regions to OpMNPV (family Baculoviridae, genus Nucleopolyhedrovirus) infection. Package size did not affect the potency of stored TM Biocontrol-1. There were no clear, significant differences in the effectiveness among lots of TM Biocontrol-1 processed by different organizations.