Pacific Pests, Pathogens, Weeds & Pesticides - Online edition

Pacific Pests, Pathogens, Weeds & Pesticides

Bean angular leaf spot (216)

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Photo 1. Spots on trifoliate leaves caused by the angular leaf spot fungus, Pseudocercospora griseola.

Photo 2. Angular leaf spot, Phaeoisariopsis griseola, on French bean. Some spots joining together, but many limited by the veins.

Photo 3. Large oval to circular spots on pods of bean caused by the fungus, Pseudocercospora griseola.

Summary

  • Worldwide. In sub-tropics and tropics. On many types of beans. An important disease; high pod loss.
  • Spots on primary leaves round, brown, zoned, up to 10 mm; smaller, 3 mm, angular, spots on trifoliate leaves. Dark, sunken spots on stems and pods.
  • Spread is by spores in wind; also on seed.
  • Cultural control: certified seed; collect and burn trash after harvest; do not plant overlapping crops.
  • Chemical control: treat seed with carbendazim; if fungicides are needed in the field use copper or mancozeb.

Common Name

Angular bean leaf spot

Scientific Name

Pseudocercospora griseola; previously known as Phaeoisariopsis griseola and Isariopsis griseola. Several strains of the fungus are known.

AUTHOR Grahame Jackson
Information from (including Photo 3) Diseases of vegetable crops in Australia  (2010). Editors, Denis Persley, et al. CSIRO Publishing; and McKenzie E (2013) Phaeoisariopsis griseola: PaDIL - http://www.padil.gov.au; and Phaeoisariopsis griseola (PHAIGR) (undated) EPPO Global Database. (https://gd.eppo.int/taxon/PHAIGR); and from CABI (2019) Crop Protection Compendium. (https://www.cabi.org/cpc/datasheet/40010). Photo 1 Kohler F, et al. (1997) Diseases of cultivated crops in Pacific Island countries. South Pacific Commission. Pirie Printers Pty Limited, Canberra, Australia. Photo 2 R. Lafon, INRA, Bordeaux, Bugwood.org.

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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