Widespread distribution. Asia and Oceania. On cocoa and avocado. An important disease.
Leaves up to 1 m behind the shoot tip turn yellow with greenish spots. Other leaves are affected and fall. Leaf scars show brown vascular bundles; internally browning extends along the stem. Infection spreads to other branches and tree dies. The fungus grows from the leaf scars, forms spores which are spread by wind, and these infect the leaves.
Cultural control: pruning, but only on those trees with some resistance; tolerant varieties have been bred in Papua New Guinea.