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Taro (Colocasia esculenta (L.) Schott) is an important staple food crop for millions of people in developing countries. Taro production is constrained by many diseases of which leaf blight, caused by Phytophthora colocasiae Raciborski, is the most destructive and it accounts for up to 80% yield loss of taro in many countries. In Ghana, the disease accounts for 25 – 50% yield loss. Nonsustainability of cultural control method and the use of resistant varieties have compelled some farmers to abandon their fields while others have converted their farms to dry season vegetable farming. In this study, copper and metalaxyl fungicides were tested for the control of leaf blight disease of taro. In vitro fungicidal activity tests and field evaluation showed that Ridomil Gold Plus 66 WP (6% metalaxyl-M + 60% copper (I) oxide) and Metalm 72 WP (12% metalaxyl + 60% copper Original Research Article Omane et al.; JEAI, 42(3): 127-136, 2020; Article no.JEAI.56721 128 (I) oxide) at 50 g in 15 litres of water (3.3g/L) and Nordox 75 WG (86% cuprous oxide) at 75 g in 15 litres of water (5 g/L) are effective for the control of leaf blight disease of taro at 4 weekly intervals for five consecutive months in the wet season.

Improvement in the Management of Leaf Blight Disease of Taro (Colocasia esculenta) with Copper and Metalaxyl Fungicides