- Widespread. In the tropics ('old world'). On banana only.
- Oval to diamond-shaped spots up to 10 cm, brown, zoned, with yellow margins, often on spots of black cross (Phyllachora). Often merge at leaf margin.
- Spores on underside, turning spots greyish/brown.
- Minor importance on Cavendish; more severe on cooking bananas. Worse if misting oils used for black Sigatoka disease control.
- Cultural control: resistant varieties.
- Chemical control: Unlikely to be needed.
Pacific Pests, Pathogens, Weeds & Pesticides
Banana diamond leaf spot (072)
Photo 2. Association of diamond leaf spot, Cordana musae, with leaf spots of banana black cross, Phyllachora musicola. The suggestion is that Cordana is a weak pathogen needing a wound to infect.
Banana (Cordana) leaf spot, banana diamond leaf spot
AUTHORS Helen Tsatsia & Grahame Jackson
Information from McKenzie E (2013) Cordana musae: PaDIL - http://www.padil.gov.au; and (including Photo 4) McKenzie E (2013) Cordana johnsonii: PaDIL - (http://www.padil.gov.au); and Vézina A, Dreyer BS (2020) Cordana leaf spot. ProMusa. (https://www.promusa.org/Cordana+leaf+spot).
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.