USDA ARS

Aggressive Wheat Fungus Defeated with Gene Pyramid

  • Photo by USDA-ARS Cereal Disease Laboratory

    Wheat stem rust attacking wheat stems.

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‘Ug99’ is the term used for a group of highly virulent races of stem rust that emerged in central Africa starting in 1999. Since then, the Ug99 group has spread to South Africa and north to Ethiopia, Yemen, and Iran. Experts expect that it will continue to spread and will eventually reach North America. The threat to the global wheat crop is high because Ug99 is able to defeat almost all of the older resistance genes that have been used to protect wheat from wheat stem rust for the last...
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