50. The following persons are required to hold a certificate issued by the Minister:
(1) every natural person who performs an activity for which a permit is required;
(2) every natural person who, as a forest manager, farmer or as a person or employee authorized to act on behalf of a forest manager or farmer, is not required to hold a permit and who performs work involving the use of pesticides of a class designated by regulation;
(3) every natural person who is responsible for supervising on premises where an activity contemplated in paragraph 1 or 2 is performed.