Stock Photo - 11 July 2023, North Rhine-Westphalia, Saerbeck: Ole Theisinger, a research assistant at Wald und Holz NRW, shows off his paintball gun. He uses it to shoot small balls at air pressure at the oaks in an avenue. The balls, which cost 2.50 euros each, contain a pheromone to attract the oak processionary moth. In a project, eight spheres per oak tree are now being shot at different heights onto the trunks of the 70 trees along the avenue. This is intended to confuse the caterpillars of the oak processionary moth and thus prevent them from spreading. After four weeks, the procedure must be repeated. Photo: Christoph Reichwein/dpa. - Saerbeck/North Rhine-Westphalia/Germany

Stock Photo: 11 July 2023, North Rhine-Westphalia, Saerbeck: Ole Theisinger, a research assistant at Wald und Holz NRW, shows off his paintball gun.

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