A method and apparatus worn by a user for controlling weeds using concentrated solar energy is disclosed. Solar energy may be concentrated by Fresnel lens over the wearer and directed by manual methods by the wearer at surfaces of weed plants to heat portions thereof causing damage. Shutters or other devices may be used to direct, and control intensity of concentrated, solar energy, such control preferably applied before significant concentration of the solar energy. In some embodiments, solar energy concentration apparatus may be integrated with solar photovoltaic cells for generating electric power for purposes such as an electrical temperature sensor, a camera and video display device for viewing underneath a crop canopy, control of solar intensity and other purposes.