But biosecurity is not trivial, and one apple can make a difference
Australia is now the only country in the world that is not infected by a particular disease that infects bees. New Guinea, previously free, now has the infection as of a decade or so ago. In the USA it is rife and Oz now has a large export market for disease free bees to pollinate Californian crops. Victoria agricultural land now has to deal with an invasive species that was introduced in the mid 80's. Our tropical wetlands are infested with introduced species that some one probably thought would look nice in the garden. What I don't understand is the people who declare that they have no food yet on inspection they have suitcase after suitcase loaded with the stuff. Once picked up at the carousel by a Beagle who detected the banana we had had in a bag, and left on the aircraft. Once crossing a border in Oz we had a load of fruit on board and had to surrender, asked if we were returning the same way, which we were, were invited to stop and take what we wanted.