A method of selectively eradicating plants includes generating images of multiple plants arranged in a bed using a camera mounted to a mobile chassis moving along the bed, determining respective locations of the multiple plants from the generated images, selecting from among the multiple plants one or more target plants to be eradicated, and eradicating the one or more target plants by accelerating a blade of a rotary cutter to strike the one or more target plants as the mobile chassis moves along the bed, and to decelerate the blade to avoid eradicating unselected plants as the mobile chassis moves along the bed, wherein the rotary cutter is carried by the mobile chassis and rotatable about an axis extending in the direction along which the mobile chassis is moved.