Narrow distribution. Philippines and Oceania. Fungal disease; possibly serious, but little researched.
Spots, round to irregular, grey-brown, with yellow halo on mature leaves. A wet weather disease; spores spread by wind and rain from underside of leaves.
Cultural control: difficult as plants harvested at different times and replanted in same place. Remove infected leaves and burn them to delay onset of disease during wet times; practice crop rotation, and plant 'gardens' at one time.
Chemical control: not appropriate – uneconomic, and potential to contaminate fresh water lens.
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.