- Worldwide. Only recorded from cassava. A minor disease.
- Spots are roundish, brown with dark borders, up to 15 mm, limited by veins, often with a yellow halo. Leaves turn yellow and fall. Mostly, on lower leaves, from 5-6 months after planting. Root losses reported up to 30%, but in the Pacific the effect appears to be small, but not tested.
- Spread in wind and rain, and on cuttings.
- Cultural control: practice crop rotation; wide spacing; plant so that the crop matures in the drier season; do not plant new crops next to old; tolerant varieties; collect and burn trash after harvest.
- Chemical control: not recommended.
Pacific Pests, Pathogens, Weeds & Pesticides
Cassava brown leaf spot (095)
Photo 1. Small round leaf spots, with distinct yellow halos of cassava brown leaf spot, Cercosporidium henningsii.
Cassava brown leaf spot
Passalora henningsii; previously, Cercosporidium henningsii, Cercospora henningsii. It is also known as Mycospaerella henningsii, after the sexual state.
AUTHORS Helen Tsatsia & Grahame Jackson
Information from (including Photo 1) McKenzie E (2013) Passalora henningsii 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.