Aphids are found many places on earth. Aphids are most common in temperate zones. Aphids can travel far in the air. For example, the lettuce aphid spread from New Zealand to Tasmania. They have also been spread by human transportation of infested plant materials.
- "Landline: Scientist battles lettuce aphid.". Australian Broadcasting Corp. 30 October, 2005. http://www.abc.net.au/landline/content/2005/s1493620.htm. Retrieved 1 January 2007.