- Worldwide distribution. On peanuts, and other plants belonging to the genus Arachis. An important disease.
- Rust infects all parts of peanuts above ground: the red-brown spots produce masses of spores. Losses in pod yields of 40%.
- Spores spread in wind; infection needs water on plant surfaces, and high humidity.
- Cultural control: avoid planting next to old crops; leave at least 4 weeks between crops – rusts do not survive in plant debris or the soil; remove “volunteers”; inspect twice weekly; tolerant varieties.
- Chemical control: begin to spray as soon as spots are seen and no later than 30-35 days; use chlorothalonil (also effective against leaf spots) at 10-14 days until 14 days before harvest.
Pacific Pests, Pathogens, Weeds & Pesticides
Peanut rust (034)
Photo 1. Upper leaf surface showing typical yellowing of leaves at late stage of infection by Puccinia arachidis. The leaves dry up but remain attached.
Photo 2. Same leaf as in Photo 1, with the underside showing numerous orange-brown pustules where millions of spores of Puccinia arachidis are produced.
AUTHORS Helen Tsatsia & Grahame Jackson
Information from DAF (2018) Rust. Queensland Government. (https://www.daf.qld.gov.au/business-priorities/agriculture/plants/crops-pastures/broadacre-field-crops/managing-peanut-diseases/rust); and CABI (undated) Ground leaf rust Puccinia arachidis. Plantwise Knowledge Bank. (https://www.plantwise.org/knowledgebank/datasheet/45745#DistributionSection); and from Korus KA, Dufault N (undated) Peanut rust fungus: Puccina arachidis Speg. UF/IFAS Extension (https://sfyl.ifas.ufl.edu/media/sfylifasufledu/alachua/word/images/pdf/Peanut-Rust.pdf). Photo 4 McKenzie E (2013) Puccinia arachidis PaDIL - (http://www.padil.gov.au).
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.