Farmers may think crops are healthy until harvest; the signs only show on roots.
 BBC News by Matt McGrath (excerpts):  UN scientists are warning that a virus attacking the cassava plant is nearing an epidemic in parts of Africa.  Cassava is one of the world's most important crops, providing up to a third of the calorie intake for many people.  The food and agriculture organization of the UN says the situation is urgent and are calling for an increase in funding for surveillance.  None of the ...
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