Forest Investment Account

Abstract of FII Project R04-007

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Development of hazard rating systems for the hemlock looper, blackheaded budworm and forest tent caterpillar.

Author(s): Otvos, Imre (Canadian Forest Service)
Subject: Entomology, Forestry, Silviculture/Forest Management Systems, Technology/GIS/Modeling/Remote Sensing
Series: Forest Investment Account (FIA) - Forest Science Program


The aim of this project is to identify areas where past outbreaks of blackheaded budworm have occurred (forest tent caterpillar and hemlock looper were done previously), and use these data to determine where future outbreaks are likely to occur. Biogeoclimatic zone maps will be overlain with outbreak-prone areas to determine what zones and sub-zones are most susceptible. This information will be provided to forest managers, who may choose to avoid planting the principal host tree(s) in the most outbreak-prone areas. Pheromone traps should be placed in these stands for monitoring populations. To minimize hard data gathering (such as pheromone trapping of male moths or collecting various life stages), various correlations will be done for at least one past outbreak (from rise to collapse of population) to determine if outbreaks can be predicted using less labour-intensive sampling procedures. Promising correlations will be incorporated into the hazard rating system for blackheaded budworm.

For further information, please contact Imre Otvos, Canadian Forest Service (

Updated September 08, 2005 

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