The UN Office on Drugs and Crime estimates in its annual Southeast Asia Opium Survey that Myanmar's production of opium in 2013 will be 870 metric tons. It would remain the second-largest grower after Afghanistan.
The amount is a 26 per cent rise over 2012 production.
The report says rising local and regional demand for illicit drugs has also have fueled the increase.
The UN agency says the trend is particularly alarming as economic integration and improved infrastructure binding Southeast Asia and southern China facilitate opportunities for criminal trafficking.
