Beneath the scorching sun in Pakistan's southern mango belt, labourers balance on tree branches, working at a swift pace to throw the freshly picked fruit into sacks held ready by farmhands waiting below. Though mango season is well underway, far less of the fruit will be bound for the lucrative export market than usual, with Pakistan's agriculturally dependent economy caught in the crosshairs of the Middle East crisis that its government has helped mediate.