Early Detection of Bark Beetles

A friend of a friend first informed me of this problem:

In the past decade, massive outbreaks of bark beetles have caused large-scale decline of coniferous-dominated, prevailingly managed forests of Central Europe (e.g. in Austria or Bavaria). Timely detection of newly infested trees is important for minimizing economic losses and effectively planning forest management activities to stop or at least slow outbreaks.

Disclaimer: This problem statement was copy-pasted from this awesome paper: Early detection of bark beetle infestation in Norway spruce forests of Central Europe using Sentinel-2