- Narrow distribution. Indonesia, Oceania. On Acacia and trees in the legume family. A minor disease, but trees of some species weakened by attack and more susceptible to stress. Used as a biocontrol agent of Acacia in some countries.
- Rust has chemicals that cause trees to produce hard brown galls up to 150 mm. The shape and size and the part of tree attacked varies with the species. On some trees the fungus causes masses of shoots to develop, called a witches’ broom.
- Spread by spores from young galls blown by wind.
- Cultural and chemical control: no recommendations.
