Abstract: The invention comprises a stump grubber (10, 50) and a method of utilising it for the grubbing of stumps (38) and a method for preventing fungus disease such as root rot. Attached on the frame (14, 54) of the stump grubber are coupling means (13, 53) for coupling the stump grubber to a work machine (12, 52) and gripping means (32, 34, 36, 70) for gripping the stump (38) and a blade (18, 58) arranged to cut downwards to sever the roots (46) around the stump (38). The gripping means (32, 34, 36, 70) comprise no less than four spikes or blades (32, 34, 36, 71-75) arranged to penetrate into the stump (38). Also supported on the frame (14, 54) are power means (24, 56), such as a hydraulic cylinder for moving the gripping means (32, 34, 36, 70) and the cutting blade (18, 58) in a vertical direction relative to each other to lift the stump (38) from the ground (44).