Stock Photo - 14 May 2020, Saxony-Anhalt, Havelberg: Diana Hey (l) from the Lower Forestry Authority of the Stendal District, instructs the pilot (M) of the helicopter in the area to be approached. Meanwhile, a helper cleans the helicopter's windshield with a sponge. In the district of Stendal, the fight against the oak processionary moth has begun. The helicopter mission lasts four days during which a total of 1200 hectares are flown. The biocide ""Forey ES"" is sprayed via nozzles onto the crowns of the trees. The Frasgift is intended to kill the pest in order to protect the trees from damage by the caterpillar of the oak processionary moth. After the helicopter has been used, further tree stands are treated by sucking off the caterpillars or by spraying with ground cannons. The measure lasts until the end of August. Photo: Klaus-Dietmar Gabbert/dpa-Zentralbild/ZB. - Havelberg/Saxony-Anhalt/Germany