To make matters worse, the threat from stripe rust (Puccinia striiformis) has also been worsening.
ECONOMIST: Wheat rust and world farming
Separately, researchers have cracked the mystery of how stripe rust is able to overcome resistance in wheat so quickly.
Until recently it was thought that stripe rust reproduces asexually.
But new research found that, like stem rust, stripe rust increases its genetic variability by reproducing sexually on the leaves of another host plant (the barberry), making itself more adaptable and more deadly.
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