Media playback is unsupported on your device

Red spider mites threatening Colombian coffee crop

7 September 2012 Last updated at 18:16 BST

One of Colombia's main coffee producing regions is seeing its harvest threatened by a tiny but destructive pest.

Red spider mites, a miniscule species of arachnid, are attacking the leaves of coffee plants in Caldas on a scale not seen before - and farmers are facing a real battle to save their crops.

Tom Bayly reports.