However, U. falcatarium is closely related to the acacia gall rust fungus U. tepperianum, which has almost 100 known hosts including plants from several tribes of Mimosoideae.
[2] Research suggests that U. tepperianum may comprise several unrecognized taxa with greater levels of host specificity.
[4] The authors of this last study considered these spores to be from U. tepperianum but did not report how they determined the identity of the fungus used for their experiments.
Uromycladium falcatarium has been reported from Indonesia, Malaysia, Philippines, and Timor Leste[1] primarily from areas where its host tree F. moluccana is cultivated for timber production.
First reported in the Philippines in 1990 falcataria rust gall fungus disease spread to Sabah, Malaysia in 1992, and to Indonesia starting in 1997 on Seram island Maluku Province, Java in 2004 and Bali in 2006.