木 (wood) 薯 (yam)
But this was not mosaic disease, which only stunts the plants. Her field had been attacked by a new and more damaging virus named brown streak, for the marks it leaves on stems.
That newcomer, brown streak, is now ravaging cassava crops in a great swath around Lake Victoria, threatening millions of East Africans who grow the tuber as their staple food.
- Virus Ravages Cassava Plants in Africa, by Donald G. McNeil Jr., The New York Times
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