The Asiatic citrus psyllid (ACP – Fig. 1), Diaphorina citri, is a major pest of citrus in North and South America, throughout Asia, and some South-Pacific islands (e.g. north-western Papua New Guinea). While ACP may cause damage to flushing citrus in its own right, its role as a vector of huanglongbing (HLB) (also called citrus greening) is of great importance when both are present. This bacterial disease (Candidatus Liberibacter asiaticus) is considered by many to be the most important and damaging disease of citrus in the world and has only two main vectors: ACP and African citrus psyllid, although recent evidence suggests other psyllids (Cacopsylla citrisuga – pomelo psyllid, and Diaphorina communis) can acquire and perhaps transmit the disease 5, 7. None of these psyllid species, nor HLB are currently found in Australia, but would present a significant economic threat to citrus growers if it were to become established. While other psyllids have been reported on citrus around the world, only ACP and African citrus psyllid are significant pests 10.