July 2009. Biosecurity Queensland reported that the tiny gall-fly (Cecidochares connexa) was proving to be very successful in controlling outbreaks of Chromolaena. However, experiences in FSM and Indonesia are not as encouraging.

The gall-fly was first used by the Queensland Government as a biocontrol agent in Indonesia in 1996, and then with great success in Papua New Guinea from 1998 until 2007. It was said that word of the success of the PNG program has spread to other neighbouring countries that are also battling infestations of Chromolaena.

Biosecurity Queensland conducted a similar project in East Timor in 2005 and have now been approached by colleagues in China and more recently Thailand.

However, a member from Pohnpei, Federated States of Micronesia wrote:

The gall fly, C connexa, doesn???t give good control in Micronesia. Although the fly is well established, Chromolaena is still growing well. The same results have been observed in all four states of FSM and Palau.

Indonesia reported the same for Java.