Canadian Forest Service Publications
Predicting jack pine budworm defoliation. 2013. MacQuarrie, C. Natural Resources Canada, Canadian Forest Service, Great Lakes Forestry Centre, Sault Ste. Marie, Ontario. Frontline Express 72. 2 p.
Issued by: Great Lakes Forestry Centre
Catalog ID: 34924
Availability: PDF (download)
Plain Language Summary
This two-page note gives an overview of an analysis of key factors affecting jack pine budworm damage. Identifying these factors helps managers predict defoliation risks and develop effective strategies for dealing with future outbreaks. Jack pine budworm is the most serious pest of jack pine and can cause major economic losses. An outbreak in the 1980s resulted in an estimated volume loss of 3.5 million m3 from growth suppression and over twice that volume from mortality. Previous analyses identified the presence of pollen cones to be an important factor in survivorship of young budworm, because they feed on these before new needles emerge. This more detailed analysis revealed other factors that are also important. These included defoliation in the previous year and soil texture and type. This research aligns with the government’s mandate to protect Canada’s natural resources from disturbances.