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

Palmer amaranth pops back up in Ontario

Weed infamous in U.S. for multiple herbicide resistances

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)

Arkansas confirms first-ever glufosinate-resistant broadleaf

Researchers find Palmer amaranth strains in two counties

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. (United Soybean Board photo)

Minnesota finds source of Palmer amaranth on CRP land

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)

Minnesota probes Palmer amaranth’s sudden appearance

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