Around 20,000 children aged 12 to 17 are working in the lucrative production of vanilla in Madagascar, the International Labour Organisation said on Tuesday...Madagascar is the world's leading producer of vanilla, producing 60 percent of global supply...Ntsay [of ILO] said cultural norms lay behind the use of child labour. One person involved in the sector, who asked not to be named, said the training of children was necessary to keep the skill alive.