books.google.de - Biological control of weeds has been practised for over 100 years and Australia has been a leader in this weed management technique. The classical example of control of prickly pears in Australia by the cactus moth Cactoblastis cactorum, which was imported from the Americas, helped to set the future...http://books.google.de/books/about/Biological_Control_of_Weeds_in_Australia.html?hl=de&id=PN8xW4uuf3EC&utm_source=gb-gplus-shareBiological Control of Weeds in Australia
