Pacific Pests, Pathogens & Weeds - Mini Fact Sheet EditionCassava grey leaf spot (321)
Pacific Pests, Pathogens & Weeds - Mini Fact Sheet EditionCassava grey leaf spot (321)
Summary
- Worldwide. A minor fungal disease of cassava (more important on rubber).
- Similar to Passalora henningsii (see Fact Sheet no. 95), but affected areas usually larger, more angular, and more often cause death of leaves.
- Leaf spots are circular, up to 10 mm diameter, with pale centres and wide brown or purplish borders.
- Cultural control: none.
- Chemical control: none. (Chlorothalonil and mancozeb have been recommended against the disease on rubber.)
Common Name
Casava grey leaf spot
Scientific Name
Periconia manihoticola; a previous name is Haplographium manihoticola.
AUTHORS Grahame Jackson & Eric McKenzie
Photos 1&2 (taken by Eric McKenzie), and used in this fact sheet, appeared previously in McKenzie E (2013) Periconia manihoticola PaDIL - (https://www.padil.gov.au). Photo 3 Valmir Duarte, Universidade Federal do Rio Grande do Sul.
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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