Canadian Forest Service Publications

Experimental aerial application of a new isolate of the nucleopolyhedrovirus CfMNPV against Choristoneura fumiferana (Lepidoptera: Tortricidae) 2003. Cadogan, B.L.; Scharbach, R.D.; Brown, K.W.; Ebling, P.M.; Payne, N.J.; Krause, R.E. Crop Protection 23: 1-9.

Year: 2003

Issued by: Great Lakes Forestry Centre

Catalog ID: 24286

Language: English

Availability: PDF (request by e-mail)

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A new isolate of spruce budworm Choristoneura fumiferana multicapsid nucleopolyhedrovirus called Tortrivirus and designated CfMNPV-T3 was field tested in 1998–1999 to evaluate its efficacy against C. fumiferana. A double application of the virus was sprayed aerially at 5.0×10 11 occlusion bodies in 2.5 l of diluent carrier per hectare. Following the application in 1998, viral infection of spruce budworm larvae increased significantly but there were no linear relationships between spray deposit, larval infection and insect population reduction and no epizootic was initiated. As a consequence, larval infection reverted to incipient levels in 1999. Spruce budworm population reductions that could be attributed to the virus were <10% and mean defoliation in thevirus-treated plots exceeded 50% in both years. These findings indicate that CfMNPV-T3 was not therefore, as effective in controlling C. fumiferana populations as laboratory studies had suggested it would be.