Seed potatoes belonging to "Atlantic", "Donna", "Kennebec", "Russet Brubank", "Sebago" and "Shepody" varieties originating in Canada may enter into the Italian territory during the following periods: a) from 15 January 2000 to 31 March 2000; b) from 1 December 2000 to 31 March 2001; c) from 1 December 2001 to 31 March 2002. Operators importing the above-mentioned seed potatoes must obtain the certificate, issued by the Canadian phytosanitary authority, referred to in article 2. Seed potatoes may