The multi-billion-dollar citrus industry in the US is under serious threat from a disease.

Citrus greening, for which there is no known cure, is spreading across the US and wiping out orange groves in huge numbers.

Millions of dollars are being poured into research but it is leaving scientists baffled and farmers worried that their entire industry could be crippled by the disease.

Al Jazeera visited one of the largest producers of the fruit in Florida, from where Andy Gallacher reports. 

Source: Al Jazeera