WHISTLER — As Western spruce budworm populations continue to spread through Whistler’s forests at historically unprecedented levels, the BC government is preparing to spray thousands of hectares around the resort municipality with a biological insecticide to blunt the outbreak. The Ministry of Forests is planning to aerially treat areas using Bacillus thuringiensis var. kurstaki (Btk)—a naturally occurring soil bacterium used for decades to control defoliating insects. Taylor Holt, the provincial resource coordinator, said… the aerial overview surveys in 2025 picked up 275,000 hectares of damage. [It’s] nearly three times as much damage as noted ever historically.” …Cheakamus Community Forest (CCF) executive director Heather Beresford, said. “So this is really the only viable treatment.” Still, she acknowledged the decision comes with uncomfortable trade-offs between wanting to prevent dead trees from posing a wildfire risk and protecting local non-budworm species who will be affected by spraying BtK.