Occurrence and potential spread in Australia
Around the world, the distribution of RWA is primarily associated with cereal production regions charcterised by warmer, drier climates. It is less prevalent or nonexistent in higher rainfall areas. This species has a wide range of Graminaceous host plants, including cultivated and wild grasses, which occur widely throughout Australia. RWA has a history of successfully invading new regions, partly due to its widely available host plants, and capacity for rapid population growth. Aphids could potentially disperse to new areas on contaminated plant material, on machinery and other equipment, or via dispersal of winged adults over large distances by wind assisted flight.