Stem rust threatens key crops in Asia.

The average human being eats more than 500 calories worth of wheat every day — it is a staple among staples. Now, a strain of fungus that threatens most of the world’s wheat crop has spread from its origin in Africa, across the Red Sea to Yemen.

Prevailing winds will probably start moving the fungus spores eastwards, experts say. The fungus could be in South Asia in four years, where wheat is the number-one crop in Pakistan and the number-two crop in India.

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