The last major outbreak was in the 1980s, so the region is likely at risk of another severe infestation soon
THUNDER BAY — A forest pest that causes severe damage to fir trees is overdue for a big rebound in Northwestern Ontario, but its advance this year may have been slowed by hot weather last year.
Newly-hatched larvae will spin cocoons in protected areas on the host tree, where they spend the winter. Scarr said two scientists from the GLFC are working with an Ontario Ministry of Natural Resources specialist to try to determine if the theory is correct. The MNR doesn't consider the current extent of the budworm infestation in the Northwest to be enough to warrant mitigation measures including the application of an insecticide.
Defoliation begins at the top of the tree, and causes severely-affected trees to turn a rust colour as the needles dry out.
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