The powers conferred upon any cotton pests abatement district and its board of directors by the provisions of this chapter shall not be construed to be in lieu of other disease, pest, or insect control statutes, but an addition thereto, and no act of any district or of any of its directors, agents, or employees shall operate to deprive or hinder the duly appointed or designated state, county, or federal authorities in conducting any operation for the eradication or control or prevention of any disease, insect, or pest in the district.