Tamarixia

Tamarixia is a genus of tiny parasitic wasps in the family Eulophidae. The best-known species, Tamarixia radiata, is widely used in biological control of citrus pests. It is an endoparasitoid of psyllid nymphs.

Tamarixia radiata specializes on the nymphs of the Asian citrus psyllid (Diaphorina citri), a major pest of citrus and a vector of citrus greening disease. Females lay eggs inside psyllid nymphs; the developing larva consumes the host from within, eventually killing it. Adults emerge from the host casing. The duration of development is influenced by temperature, typically spanning several weeks.

Native to Asia and the Indian subcontinent, Tamarixia radiata has been introduced to many citrus-growing regions in the Americas, Africa, and the Middle East to suppress Diaphorina citri populations as part of integrated pest management programs. Releases are designed to augment natural enemies and reduce reliance on chemical controls. While radiata is the most widely used Tamarixia species for D. citri, other Tamarixia species exist. The genus supports biological control of psyllids, and ongoing research examines host range, non-target effects, and long-term establishment in new environments.