Jorhat, Feb. 7: Tea producing countries around the world have agreed to do away with the export of inferior quality teas by sticking to the quality norms defined by the ISO 3720 standard. Tea Research Association additional vice-chairman Prabhat Bezboruah said tea producing and exporting countries have agreed to abide by the standard and print it on bulk and retail packs at the just concluded 20th session in Sri Lanka of the inter-governmental group under the UN Food and Agriculture Organisation.