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.