Abstract

The forest tent caterpillar, Malacosoma disstria, is a significant pest of hardwoods in Canada and the United States. Periodic heavy outbreaks of this insect cause appreciable losses in tree growth and fiber production in aspen stands and reductions in the yield of maple syrup and syrup products. Furthermore, large numbers of migrating larvae can have adverse effect on tourism and recreation. The Forest Pest Management Institute is trying to develop biorational control agents for this pest. A nuclear polyhedrosis virus (NPV) of this insect has shown promise as an insecticide, and has been successfully used in field trials. At present the virus can be produced only in the host larvae. However, continuous cell lines, IPRI-MD-66 and IPRI-MD-108, have been established from the hemocytes of this insect to develop an alternative method of virus production.

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