If termination of a marketing order is sought by petition pursuant to subdivision 2 of section 294 of the Agriculture and Markets Law, or if the commissioner shall decide in the exercise of his discretion that an order should be terminated, he shall hold a hearing on notice as hereinbefore specified, and shall conduct the prescribed referendum vote of producers in the area affected. The vote shall be announced as heretofore mentioned by section 200.8 of this Part. If the vote is to terminate, the commissioner shall certify that 50 per centum of the producers participating in the referendum approved termination. If the vote is against termination, the decision shall state the vote and certify that less than 50 per centum of the producers participating in the referendum approved termination.