Pacific Pests, Pathogens and Weeds

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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 fungus on rubber.)