Source: Kansas State University
Kansas State University scientists have completed long-term evaluations of a limited number of independent kochia (Kochia scoparia) populations on privately-owned land in western Kansas that are now confirmed to be glyphosate-resistant. These populations have undergone both greenhouse and field testing by K-State and Monsanto personnel.
Kochia, also called fireweed, is a drought-tolerant weed commonly found in cropland, rangeland and pasture, and non-agricultural sites in arid and semi-arid regions of the western United States and Canada. Kochia is highly adaptable and grows on many soils including saline and alkaline soils.
Phil Stahlman, who is a weed scientist with K-State Research and Extension, has listed as many as five glyphosate-resistant kochia populations in western Kansas on the International Survey of Herbicide Resistant Weeds Web site (www.weedscience.org) following lengthy evaluations of greenhouse and field studies. He, along with K-State scientists Kassim Al-Khatib, Curtis Thompson, and other colleagues, including Monsanto scientists, have investigated the sites independently, focusing on the variability of the resistance and difficulties in proving heritability—a trait required for confirmation of resistance.