Seed of key agricultural species, including wheat, can only be marketed if it has been certified, following crop inspection and laboratory analysis.
Ni chaniateir marchnata hadau rhywogaethau amaethyddol allweddol, gan gynnwys gwenith, oni fyddant wedi eu hardystio, a hynny yn dilyn proses o archwilio cnydau a’u dadansoddi mewn labordy.