• Sippell, W. L.
  Great Lakes Forest Research Centre, Canadian Forestry Service
  

Damage mapping of defoliation and tree mortality caused by the spruce budworm (Choristoneura fumiferana (Clem.)) has been carried out by a federal department in different parts of Canada over almost three-quarters of a century. The resulting cartographic information has become distinctly more reliable and complete, especially since 1947. Beginning in 1980, a Working Group studied and compared the procedures used by the Canadian Forestry Service in different regions of Canada, under Studies A^4 and A^5 of the Spruce Budworm Implementation Plan. Various problems associated with damage mapping have been identified and 16 recommendations are offered for their solution. A rationale, based on demonstrated values, is provided for the continuation and support of damage-mapping in all regions of Canada. Also, new research and experience are called for. Some recommendations are designed to encourage and facilitate inter-regional coordination at the national level; others aim to improve national damage maps through greater compatibility of the respective regional components in terms of interpretation, accuracy and completeness.