[1] This wasp is a native of India, Sri Lanka, Pakistan, Hong Kong, Sichuan, Java and Malaysia.

It has been introduced to Guam, Venezuela, Mexico and the United States (Texas, Florida and Hawaii) for the purpose of controlling the citrus blackfly.

A female larval host results in the production of two or three adult wasps but parasitism of a male pupa produces only one.

However it is not good at searching out scattered individuals and its numbers decrease sharply as its host population is controlled.

E. perplexa multiplies more slowly but is better at scouting for outlying blackflies and is more effective when populations of potential hosts are lower.