UPDATE 1-Indonesian coffee exports jump so far in 2012/13 - ICO
* Vietnam coffee exports drop to 15.98 mln bags
* Global arabica, robusta exports rise
* Robusta exports increase in east Africa
(New throughout, adds data details, removes dateline)
July 1 (Reuters) - Coffee exports from Indonesia, the world's third biggest grower, soared in the first eight months of the 2012/13 season, helping to feed rising demand for both arabica and robusta beans, the International Coffee Organization (ICO) said on Monday.
Coffee exports from Indonesia, which produces both arabica and robusta, jumped 53 percent to 6.5 million 60-kg bags between October 2012 and May 2013, versus the same period a year ago, ICO data showed.
Meanwhile, exports from top robusta grower Vietnam fell to 15.98 million bags in the first eight months of the current crop year from 16.25 million bags in the previous year.
Arabica is usually roasted for brewed coffee, and robusta is processed into instant coffee or added to roasted blends as a lower-cost option.
Globally, coffee exports were up by 5.2 percent at 75.69 million bags for the first eight months of the 2012/13 season, which began on Oct. 1. In May, they totalled 9.75 million 60-kg bags, down about 5.5 percent from the same month in 2012, according to ICO data.
Exports for both arabica and robusta rose in the 12 months ended May. Arabica climbed by 5 percent to 68.22 million bags versus a year ago, and robusta rose by 14 percent to 45.03 million bags, the ICO said.
While robusta exports dropped in several countries, east Africa helped to pick up the slack for rising demand, with Ugandan exports in the first eight months of 2012/14 jumping by 50 percent to 1.7 million bags. Tanzanian exports more than doubled to nearly 400,000 bags, the data showed.
In May, global robusta coffee exports were at 3.82 million bags, down from 4.55 million a year ago, while arabica coffee exports rose to 5.93 million bags, up from 5.77 million bags.
Brazil, the world's biggest coffee producer, has increased its exports so far in 2012/13 to 21.2 million bags from 19.97 million during the same period a year ago. But the amount of robusta it exported during this time dropped by 18 percent to nearly 605,000 bags.
It also exported less washed arabica beans, a segment believed to be growing in the country, at 118,527 bags so far in 2012/13, down more than 60 percent from a year ago.
Exports from Colombia, the world's biggest producer of washed arabica beans, reached 5.78 million bags in the first eight months of this crop year, up 15 percent from a year ago.
(Reporting by Nigel Hunt in London and Marcy Nicholson in New York; Editing by James Jukwey and Jeffrey Benkoe)