| Disease Name | Cassava Brown Leaf Spot |
|---|---|
| Caused by | |
| Predisposing Environment | Cassava Brown Leaf Spot, caused by the fungus Passalora henningsii (previously known as Cercosporidium henningsii, Cercospora henningsii, or Mycospaerella henningsii), is a disease that affects cassava plants. It is usually found in the tropics, including Asia, North America, South America, Central America, the Caribbean, and Oceania. The disease primarily affects older leaves and becomes more noticeable around 5-6 months after planting. The spots on the leaves are circular and can reach up to 15 mm in diameter. They become angular and are limited by veins. On the upper surface of the leaves, the spots are brown with dark borders and sometimes surrounded by indistinct yellow margins. On the underside, the spots are grey with less distinct borders. The severity of Cassava Brown Leaf Spot is influenced by warm and humid weather conditions. The fungus produces spores on the lower surface of the leaves, which can be spread by wind and water-splash. Long-distance spread can occur when spores are carried on planting material. Losses in root yield of up to 30% have been reported in Africa, up to 23% in South America, and 17% in India. |
| Affects Crops |
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