Abstract: A rectangular metallic plate cutting blade having an opening at the center thereof for attaching the plate to a rotary power shaft. A pair of trapezoidally-shaped cutting recesses are cut into the leading edges of the blade. The edges of the plate defining the cutting recesses are beveled to provide sharp cutting edges. A turbulence flange extends upwardly from the trailing edge of the metallic plate on the opposite side of the plate from each of the trapezoidally-shaped cutting recesses. Each of these turbulence flanges is from about 1.0 to about 1.5 times as long as the width of the trapezoidally-shaped recess with which it is aligned across the blade, and defines an angle of from about 35.degree. to about 55.degree. with respect to the major plane of the rectangular plate.