Australia is an island so it has a fairly unique biodiversity. For international flights bringing in fruits is a concern since it can introduce pests that don't otherwise exist in Australia.
Australia is also a very large island, and the biodiversity of the east coast is very different to that of the west coast, so the same concerns apply. If you drive along the highways between states you'll see signs telling you to dispose of your fruit.
Australia is also a very large island, and the biodiversity of the east coast is very different to that of the west coast, so the same concerns apply. If you drive along the highways between states you'll see signs telling you to dispose of your fruit.
http://www.interstatequarantine.org.au/