Plants Act 1970.

If the Director-General has reason to believe that any disease, pest, or residue of toxic chemical is present in any crop which the grower intends to pack and submit for export, and in the opinion of the Director-General that disease, pest, or residue is present to such a degree that it would be impossible by grading and post-harvest treatment to eliminate the disease or pest and all infected plant material, or to reduce the residue to a level which in his opinion is permissible, he may by notice in writing direct the grower not to submit for export all or such portion of the crop on all or such portion of the property of the grower as the Director-General may decide. Any grower or any other person who, contrary to any such notice, packs or submits any crop for export commits an offence against this Act. Regulation making powers of the Governor-general are prescribed.