Prickly pear was conquered 90 years ago. Here's how it was done

90 years since Australia's the prickly pear infestation was conquered.

Farming has been in the Geldard family for four generations, but one plant almost brought them to their knees early on.

Prickly pear is considered one of the greatest biological invasions of modern times, infesting millions of hectares of rural land in Australia a century ago and rendering it virtually useless and worthless.