Fecha de publicación: 22/04/2021 Fuente: WIPO "varroa" The invention relates to a heatable centre wall (3) for a beehive for the hyperthermal reduction of varroa and/or for heating honeycombs for maximizing the harvest yields, wherein the centre wall (3) comprises a continuous PTC heating foil (6) having a non-linear PTC effect, wherein the PTC heating foil (6) has on at least one side a layer (7, 8) having a comb pattern.