Mass rearing Diomus pumilio: A predator of Asian citrus psyllid

Efficient and economical natural enemy rearing methods are an integral part of an Asian citrus psyllid (ACP) biological control program. Diomus pumilio is a generalist predator who specializes on psyllid eggs. Originally introduced into California to control the invasive albizzia psyllid, recent studies have found D. pumilio may be an effective predator of ACP. The beetle has been reared on ACP, potato psyllid, mesquite psyllid, and Heteropsylla sp. in small numbers under laboratory conditions. However, not all psyllids are viable host options for mass rearing D. pumilio. ACP is an invasive pest and vector of HLB. It is a high-risk insect, and due to permitting requirements, a costly insect to rear. Potato psyllid also poses a risk of disease transmission as a vector of zebra chips disease. Honey mesquite is a deciduous plant producing new flush only part of the year, limiting mass rearing potential. Potato psyllid and mesquite psyllid also have a relatively low reproductive capacity. Sweet Acacia produces new flush continuously, and is capable of supporting a large population of Heteropsylla sp.. Using Heteropsylla sp. as a host, we were able to successfully establish a mass rearing program for D. pumilio.