63. Any person may institute legal proceedings in nullity of a contract he has entered into to cause the performance of work involving the use of pesticides if he ascertains(1) that the work has been or very likely will be performed by a natural person who is neither the holder of a certificate prescribed by regulation nor, on the premises where he performs the work, under the supervision of such a holder;
(2) that the work has been or very likely will be performed in contravention of the Pesticides Management Code (chapter P-9.3, r. 1).