Pacific Pests, Pathogens & Weeds - Mini Fact Sheet Edition

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Peanut rust (034)

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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.

Photo 3. Close up of the underside of peanut leaf with orange-brown spots of the rust, Puccinia arachidis.

Photo 4. Severe attack of orange-brown spots of the rust, Puccinia arachidis.

Summary

• 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.

Common Name

Peanut rust

Scientific Name

Puccinia arachidis

This mini fact sheet is a part of the app Pacific Pests, Pathogens & Weeds

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