Ripe mangosteen and rambutan hang unpicked from trees in eastern Thailand, where a shortage of migrant workers is forcing growers to decide which crops are valuable enough to harvest and which will be left to rot. For Jomsak Putirattana, who also grows durian in Chanthaburi province, the departure of his five Cambodian workers after a border dispute disrupted crossings has intensified competition for labour. Daily wages have more than doubled in some cases, from about 350 baht to 400 baht (US$10...