Oak moth infestation surges in Hesse, state forestry agency opts for monitoring over control

Hesse, Germany – The oak processionary moth infestation is spreading significantly across Hesse's forests, with high temperatures this year fueling the insect's development, according to the state's forestry agency.

The pest's stronghold in the warm southern and central regions has expanded. Notably, it is now appearing in areas previously unaffected, such as northern Hesse. Forest officials anticipate further spread into less-affected northern territories due to ongoing climate change.

Hessen Forst has decided against implementing control measures within state forests. A spokesperson explained that the moth is a natural part of the forest ecosystem and not currently considered a significant pest from a forestry management perspective. The population naturally fluctuates with weather patterns, and oak trees can typically withstand the current level of defoliation.

Rather than using pesticides, the agency is prioritizing monitoring, providing protective clothing for its employees, and implementing organizational strategies like temporarily restricting access to infested zones. Municipalities across Hesse are also reporting a substantial increase in the oak processionary moth population, with some cities like Gießen experiencing an "extreme explosion" this year. Kassel, Fulda, and Wiesbaden have likewise noted a much heavier infestation.