Jim Dice, reserve manager at UC Irvine's Steele/Burnand Anza-Borrego Desert Research Center, pulls up a Sahara mustard plant. Efforts to eliminate the mustard have been unsuccessful. "It's everywhere," a part-time resident of Borrego Springs lamented as he strode through once-pristine Tubb Canyon on the western edge of town.
Allen J. Schaben / Los Angeles Times
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