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Ug99 Fungus: Wheat Stem Rust Threatens 80 Percent Of World's Wheat

07/16/2009 05:12 am ET | Updated May 25, 2011

The spores arrived from Kenya on dried, infected leaves ensconced in layers of envelopes.

Working inside a bio-secure greenhouse outfitted with motion detectors and surveillance cameras, government scientists at the Cereal Disease Laboratory in St. Paul, Minn., suspended the fungal spores in a light mineral oil and sprayed them onto thousands of healthy wheat plants.

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