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Tag Archives: Canadian Forest Service

Traumatic resin canals, by Mike Cruickshank

Dates of root infection used to establish impact

Information Forestry, April 2008 — In order to measure a disease’s impact on a tree, you need to know when it became infected. This is difficult to do with root diseases: infection and disease progression occur underground, and above-ground symptoms may not show until years later, if ever. As well, Read more →

Trapping emerald ash borer. Photo by Pennsylvania Dept Conservation & Natural Resources, Forestry Archive - bugwood.com

Scientists search for irresistable pest perfumes

Information Forestry, December 2007—Many insects rely on scent to communicate with each other and to find food and hosts. Setting out traps baited with insect and host-tree smells has long been a technique used by plant health officials to detect and track unwanted pests. But the scents currently used by Read more →

western spruce budworm, by William Ciesla, Forest Health Management International

Ocean-temperature effects suppress caterpillar’s infestations on Vancouver Island

Information Forestry,  December 2007— A century-long ocean-warming trend may explain the rarity of western spruce budworm outbreaks on southern Vancouver Island since the 1930s, according to a study by Canadian Forest Service scientists Alan Thomson and Ross Benton. Mild winter temperatures, linked to a rise in sea temperature, have de-synchronized Read more →

Distribution of gypsy moth in Canada from 1964 to 1970. Image © Natural Resources Canada

Software tool projects effects of changing climate on range of forest pests

Information Forestry, December 2007 — Canada’s climate is changing, and forest pests are on the move. In order to track and predict long-term effects of a warming climate on pests, Natural Resources Canada scientists use a software tool originally developed to help forest managers plan short-term pest control or sampling activities. Read more →

Conifer forest damaged by western spruce budworm. Photo by USDA, David McComb.

Needle-chemistry profiling predicts budworm outbreak potential

Information Forestry, August 2006 —Budworms are among the most destructive forest insects in North America. During outbreaks, eastern spruce budworm, western spruce budworm, jack pine budworm and their relatives strip foliage from tens of thousands of hectares of susceptible conifers across the continent. Now, thanks to indicators identified by Canadian Read more →