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File photo of palmer amaranth — the taller yellowish plants — infesting a U.S. cotton field. (Photo courtesy ARS/USDA)
Crops

Palmer amaranth pops back up in Ontario

Weed infamous in U.S. for multiple herbicide resistances

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A single plant that showed up this summer on the edge of a southwestern Ontario cornfield is cause for concern among Canadian farmers, weed specialists warn. Writing Monday in the ag ministry’s Field Crop News, Ontario provincial weed management specialist Mike Cowbrough said the plant in question, found in Wellington County, is confirmed as palmer […] Read more
Palmer amaranth. (United Soybean Board photo)
Crops

Arkansas confirms first-ever glufosinate-resistant broadleaf

Researchers find Palmer amaranth strains in two counties

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Researchers in the southern U.S. have found what they say is the first broadleaf weed in the world to beat the active ingredient in BASF’s Liberty herbicide. The University of Arkansas last week announced its ag researchers had found glufosinate-resistant Palmer amaranth in crops in two eastern Arkansas counties across the Mississippi River from Memphis. […] Read more
Palmer amaranth.
Crops

Weed survival can be predicted via imagery

Researchers using imagery to predict viability of Palmer amaranth

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Researchers are putting imaging technology to work to improve weed management practices. Maor Matzrafi of the department of Plant Sciences at the University of California, Davis, has been evaluating the use of hyperspectral imaging technology to assess germination and herbicide response in Palmer amaranth. Why it matters: Weed resistance to glyphosate, a broad spectrum herbicide, […] Read more
Palmer amaranth. (United Soybean Board photo)
Crops

North Dakota still on lookout for Palmer amaranth

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CNS Canada –– Officials in North Dakota continue to hunt down suspicious plants in a bid to keep the aggressive weed Palmer amaranth from establishing there. Palmer amaranth, a pigweed species, made its first confirmed appearance in North Dakota last month, in a soybean field in McIntosh County, in the south-central area of the state. […] Read more
Palmer amaranth. (United Soybean Board photo)
Crops

Minnesota finds source of Palmer amaranth on CRP land

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Reuters — An invasive weed likely entered Minnesota through seed planted on land in a U.S. conservation program, state agriculture officials said on Thursday, bringing to a close an official probe of a growing threat to agricultural production. Infestations of the weed, Palmer amaranth, have affected other states in the U.S. Midwest through seed planted […] Read more
Palmer amaranth. (United Soybean Board photo)
Crops

Palmer amaranth threatening U.S. corn fields

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Winterset, Iowa | Reuters — A U.S. government program designed to convert farmland to wildlife habitat has triggered the spread of a fast-growing weed that threatens to strangle crops in America’s rural heartland. The weed is hard to kill and, if left unchecked, destroys as much as 91 per cent of corn on infested land, […] Read more
Palmer amaranth. (United Soybean Board photo)
Crops

Minnesota probes Palmer amaranth’s sudden appearance

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Chicago | Reuters — Minnesota has launched an investigation to find the source of seed mixes contaminated with weed seeds after the aggressive, herbicide-resistant Palmer amaranth weed was found on 30 areas planted in a federal conservation program. The weed grows very fast, reaching up to eight feet in height and can hold back commercial […] Read more

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