Stock Photo - 11 June 2019, Berlin: A tree surgeon wears a respirator mask. The health administration recently declared that there was an increased risk potential and that the population should avoid areas affected by oak processionary spinners. (to dpa: ""Small caterpillars, big effort - against the health hazard of the tree"" from 13.06.2019) Photo: Lisa Ducret/dpa. - Berlin/Berlin/Germany

Stock Photo: 11 June 2019, Berlin: A tree surgeon wears a respirator mask. The health administration recently declared that there was an increased risk potential and that.

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