A farmer holds organic coffee beans at a coffee field in the mountains of Peru's central jungle city of Chanchamayo August 11, 2008. Coffee production in Peru, the world's largest exporter of organic coffee, is booming as growers focus on quality, develop niche markets and find ways around walls that can block growth. Picture taken August 11, 2008.    REUTERS/Enrique Castro-Mendivil (PERU) - RTR21CJO