An invasive weed that has put some southern cotton farmers out of business is now finding its way across the Midwest — and many corn and soybean growers don’t yet appreciate the threat, researchers report. Palmer amaranth germinates throughout much of the growing season, starts earlier and grows faster than other weeds, and is a prolific seed producer. It can tolerate drought and heat extremes that would kill other plants. And it is becoming resistant to the most common herbicides used to combat it, a researcher reports.
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