Reduced Damaged Wood - Bark Beetle Plague in Thuringia Subsides - Thuringia's Forests Bounce Back After Devastating Beetle Crisis

Thuringia's forests are showing signs of recovery after years of severe bark beetle damage. The infested area has shrunk dramatically, thanks to colder winters and targeted forest management. However, experts warn that vigilance remains crucial as warmer months approach.

The bark beetle crisis in Thuringia peaked in 2024, with over 15,000 hectares of spruce stands affected. By early 2026, that number had grown to more than 25,000 hectares, concentrated in the northern Thüringer Wald and eastern Schiefergebirge. Drought and storm damage weakened trees, making them easy targets for the pests.

Last year, the volume of damaged wood dropped sharply to 473,000 cubic meters—far below the 3.5 million cubic meters recorded in 2024. Forest owners played a key role by felling and removing infested timber before beetles could breed again. By January, only about 3,550 cubic meters of infested wood remained unharvested.

Bark beetles thrive in weakened trees, speeding up decomposition and recycling nutrients. Their natural enemies—woodpeckers, checkered beetles, and ground beetles—help control populations. Cold weather also limits their spread: larvae and pupae die at around minus five degrees Celsius, though adults survive extreme cold by burrowing deeper and producing antifreeze.

The worst-hit regions were the spruce-dominated highlands of the Thuringian Forest and the eastern Slate Mountains. Areas around Schmalkalden, Suhl, and Saalfeld saw the most damage.

The situation has improved, but risks remain. Forest owners must stay alert as swarming begins in April or May. Continued monitoring and swift action will be essential to prevent another surge in bark beetle damage.