Worldwide distribution. On taro and some other edible aroids. An important disease.
A blight caused by a water mould, an oomycete, not a fungus. Leaves die early and corm yields are low.
Corm infections occur at harvest, resulting in firm, brown rots.
Spread is in wind-driven rain, and 'tops' for planting.
Cultural control: isolate gardens, far from those with leaf blight, preferably >500 masl; avoid planting suckers with leaves attached; inspect regularly, and remove infected leaves; harvest when leaves are dry; store corms in plastic bags (or plastic-lined boxes); tolerant (bred) varieties are main method of control.
Chemical control: copper, chlorothalonil, or mancozeb (protectants); metalaxyl or phosphorous acid (systemics).