Except as provided in subsection (b) of this section, each failure to comply with the provisions of this subtitle is a violation of this subtitle. Each violation shall be reported to the State’s Attorney for the county in which the violation occurs. The State’s Attorney shall prosecute all violations and bring an action to enjoin any nuisance. A landowner or other person who possesses and manages land infested with a noxious weed may enter into a written agreement with the Secretary that sets forth a program for the eradication or control of a noxious weed. If all of the terms and conditions of an agreement under paragraph (1) of this subsection are met, there is no violation of this subtitle as to the land covered by the agreement.