Stock Photo - 11 July 2023, North Rhine-Westphalia, Saerbeck: Ole Theisinger, a research assistant at Wald und Holz NRW, shows the special bullets for his paintball rifle. With the gun, he shoots small balls at air pressure at the oaks in an avenue. The bullets, 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 the special bullets for his paintball rifle.

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