Opinion of the Economic and Social Committee on the 'Proposal for a Council Directive amending Council Directives 66/400/EEC, 66/401/EEC, 66/402/EEC, 66/403/EEC, 69/208/EEC and 70/458/EEC on the marketing of beet seed, fodder plant seed, cereal seed, seed potatoes, seed of oil and fibre plants and vegetable seed and the common catalogue of varieties of vegetable species'.