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Pacific Pests & Pathogens - Mini Fact Sheet Edition

Bean Phaseolus rust (217)

Photo 1. Bean rust, Uromyces appendiculatus, on Phaseolus bean leaves.

Photo 2. Bean rust, Uromyces appendiculatus, on the top surface (right) and underside (left) of Phaseolus bean leaves.

Summary

Worldwide distribution. On Phaseolus species. Usually, a major disease depending on variety.
Circular pustules, 1-2 mm, light green at first on both leaf surfaces, with halos on the top. Bursting to produce reddish-brown spores.
Spread is by spores in the wind.
Cultural control: plant beans with maize, at random, not in rows; use a 2-year crop rotation; do not plant overlapping crops; resistant varieties; collect and burn trash after harvest.
Chemical control: use mancozeb, starting when the spots are first seen.

Common Name

Bean rust (Phaseolus spp.)

Scientific Name

Uromyces appendiculatus var. appendiculatus. Previously Uromyces phaseoli.

AUTHOR Grahame Jackson
Photos 1 Kohler F, Pellegrin F, Jackson G, McKenzie E (1997) Diseases of cultivated crops in Pacific Island countries. South Pacific Commission. Pirie Printers Pty Limited, Canberra, Australia. Information from Diseases of vegetable crops in Australia (2010). Editors, Denis Persley, Tony Cooke, Susan House. CSIRO Publishing.

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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