(a) The commissioner shall cancel the registration of any pesticide at the end of the five-year period which begins on the date of its registration, or at the end of any five-year period thereafter, unless the registrant, or other interested person with the concurrence of the registrant, before the end of such period, requests in accordance with regulations prescribed by the commissioner that the registration be continued in effect provided the commissioner may permit the continued sale and use of existing stocks of a pesticide whose registration is cancelled under this section to such extent, under such conditions, and for such uses as the commissioner may specify if the commissioner determines that such sale or use is not inconsistent with the purposes of this part, subsection (a) of § 23-61a or § 23-61b, and will not have unreasonable adverse effects on the environment. The commissioner shall notify the registrant, at least thirty days prior to the expiration of such five-year period, that the registration will be cancelled.

(b) If at any time after the registration of a pesticide the registrant has additional factual information regarding unreasonable adverse effects on the environment of the pesticide, he shall submit such information to the commissioner.

(c) If it appears to the commissioner that a pesticide or its labeling or other material required to be submitted does not comply with the provisions of this part or, when used in accordance with widespread and commonly recognized practice, usually causes unreasonable adverse effects on the environment, the commissioner may issue a notice of his intent either:

(1) To cancel its registration or to change its classification together with the reasons, including the factual basis, for his action, or

(2) To hold a hearing to determine whether or not its registration should be cancelled or its classification changed. Such notice shall be sent to the registrant and made public. The proposed action shall become final and effective at the end of thirty days from receipt by the registrant, or publication, of a notice whichever occurs later, unless within that time either the registrant makes the necessary corrections, if possible, or a request for a hearing is made by the registrant or a person adversely affected by the notice with the concurrence of the registrant. A decision pertaining to registration or classification issued after completion of such hearing shall be final.

(d) Final orders of the commissioner, pursuant to this section, shall be subject to judicial review under chapter 54.

(e) On and after July 1, 1981, the use of the pesticide chlordane for any purpose except the treatment of nursery stock or subsoil treatment or pretreatment of soil during construction for termites is prohibited.