The Minnesota Department of Natural Resources aerially surveyed more than 13.5 million acres last year, checking for forest damage across the state’s forestland. Its findings are included in the recently released 2025 Forest Health Annual Report. Brian Schwingle, forest health program coordinator, said the annual survey and report is important because it tracks trends and reveals what is impacting trees, allowing the managers to make decisions for healthier, more resilient forests. “The two biggest tree health stories in 2025 in Minnesota were the derecho, the big blowdown in Bemidji, and the three big wildfires in northeast Minnesota in May,” he said, noting prior spruce budworm damage helped fuel the fires. In July, a derecho damaged 11,600 acres in and around Bemidji. Derecho, a Spanish word for straight, is a widespread, straight-line windstorm associated with a band of fast-moving thunderstorms. They can leave serious damage in their wake.