Weed scientists in the southern U.S. say they have confirmed the first known case of broadleaf resistance to glufosinate — the active ingredient in Liberty herbicide. The resistance to the widely-used herbicide was found in Palmer amaranth plants from two fields in Mississippi County, Arkansas. The pigweed plants caught the attention of University of Arkansas… Read More
Palmer amaranth could be the next glyphosate resistance weed problem for Ontario farmers. University of Arkansas weed scientist Jason Norsworthy calls it “pigweed on steroids.” Norsworthy, who first saw glyphosate-resistant palmer amaranth in Arkansas in 2006, says the weed can grow two to three inches a day after it reaches four inches tall. “You can… Read More
Palmer amaranth (Amaranthus palmeri) is known by some as “careless weed,” as negligent management quickens its already hasty invasiveness. It can also be incredibly difficult to control — a characteristic that has only worsened in the last few years, as its resistance to multiple-herbicide groups continues to evolve. According to The International Survey of Herbicide… Read More