By Ben Harder
Use of a common agricultural herbicide is driving evolution of at least one weed species, a new study finds. In response to applications containing glyphosate, the tall morning glory (Ipomoea purpurea) grows increasingly impervious to that chemical, while sacrificing a measure of its fertility.
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Morning glories are popular among gardeners but unwelcome on farms. There, they proliferate rapidly, shade crop plants, steal nutrients, and clog harvesting machinery.