That is weird. If you visit the Harz National park it will say the opposite: Harz was a commercial forest, turned national park. The beetle is a danger for the

That is weird. If you visit the Harz National park it will say the opposite: Harz was a commercial forest, turned national park. The beetle is a danger for the monoculture required by the former commercial forest. By letting the beetle kill off the mono culture, more varied vegetation, trees and nature will spruce up from the decaying dead trees. These varied and original species are resistant to the beetle and the problem will solve it self. In some areas they man has planted indigenous plants to help speed up the process.