The invention relates to a device for combating the varroa mite in a beebrood, comprising at least one middle wall (15, 16) that can be inserted inparticular into a beehive (1, 2) and that is provided with brood cells (17)forfemale bees, the device having an electrical heating device that has aresistanceheating element (19) embedded in the middle wall (15, 16) and acontrol device (27, 28, 31) connected to the latter which is designed suchthatan automatically running heating process can be initiated with a temporallypre-determined heat-up phase that lasts until a temperature of 39°C to45°C,preferably 39°C to 42°C, is reached at the bottom of the broodcells (17) inthe region of the resistance heating element (19) and then with a subsequentphase of maintaining this temperature for a predetermined period of time.
