The invention relates to a beating device (1) for inactivating insects in a pourable feedstuff or foodstuff with a housing (2) which has at least one inlet opening (3) and at least one outlet opening (4) for the material to be treated and a drum (6) arranged in the housing (2) rotatably about an axis of rotation (5) wherein a plurality of blade elements (9) of a first type extending approximately parallel to the axis of rotation (5) and having a beating surface (10) are arranged between two end parts (7 8) of the drum (6) wherein the drum is partially (6) surrounded circumferentially by a wall (11) of the housing (2) and wherein the at least one inlet opening (3) and the at least one outlet opening (4) are formed in the wall (11).
