A tiny pest is threatening the US state of Florida's orange industry.<br /><br />An insect called the Asian citrus psyllid is spreading a devastating disease known as citrus greening.<br /><br />The disease is the single biggest challenge for farmers.<br /><br />Resources are being poured into research, but growing oranges is now an uncertain business.<br /><br />The citrus industry employs more than 75,000 people in the state and is worth $9bn a year.<br /><br />Al Jazeera's Andy Gallacher reports from Dundee.
