Written by: Allison Bistline-East Email: a.bistline-east1@nuigalway.ie More Research: UCR Biocontrol Website The Problem. In 2008, the Asian citrus psyllid (ACP), Diaphorina citri (Hemiptera: Liviidae), was first detected in California. Since its establishment in California, commercial citrus growers and homeowners alike have become familiar with this notorious pest and the threat it represents as a vector...