Most Australians at this point would not realise what damage the varroa mite can do. But in 2000 in New Zealand, a varroa mite outbreak led to 90% of bees being killed which almost destroyed the industry. And if that were to happen in Australia it would cause $billion in damage to Australia’s agriculture industry which relies on bees for pollination.

Source: Australia’s food security is under attack from varroa mites that kill bees. Was it an accident or was it from illegal importation of bees? – Kangaroo Court of Australia