Pacific Pests, Pathogens and Weeds - Online edition

Pacific Pests, Pathogens, Weeds & Pesticides

Acacia rust (235)

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  • 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.
Common Name

Acacia rust

Scientific Name

Uromycladium tepperianum. There are several species in this genus. Depending on the species, they may be limited to a single host, or to several hosts which are closely related.

AUTHOR Grahame Jackson
Information from Encyclopedia of Life (undated) Uromycladium tepperianum (Sacc.) McAlpine. (; and Systematic Mycology and Microbiology Laboratory, ARS, USDA. (2007). Invasive Fungi. Uromycladium tepperianum on Acacia spp. (; and Uromycladium tepperianum (Sacc.) MacAlpine (2008) Pathogen of the month. APPS. (; and from CABI (2020) Uromycladium spp. that cause gall rusts (Acacia gall rusts). Crop Protection Compendium. ( Photos 1&2 Kohler F, et al. (1997) Diseases of cultivated crops in Pacific Island countries. South Pacific Commission. Pirie Printers Pty Limited, Canberra, Australia.

Produced with support from the Australian Centre for International Agricultural Research under project PC/2010/090: Strengthening integrated crop management research in the Pacific Islands in support of sustainable intensification of high-value crop production, implemented by the University of Queensland and the Secretariat of the Pacific Community.

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