Almost a billion people around the world rely on cassava as a staple food. The root vegetable is a versatile and calorie-rich crop that is resilient enough to thrive in harsh climates. But the cassava has no defense against a tiny insect that is decimating crops across East Africa, with dire economic and humanitarian consequences. The whitefly carries two viruses that together destroy over $1 billion worth of cassava in Sub-Saharan Africa each year. Cassava Mosaic Disease (CMD) is the more established threat and does most of the damage.
http://www.cnn.com/2017/07/11/africa/cassava-disease-east-africa/index.html

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