| There are currently 3 different types (known as 'biotypes') of herbicide resistant weeds in Oklahoma. The first herbicide resistant weed reported from Oklahoma is Kochia (Kochia scoparia) with resistance to chlorsulfuron, metsulfuron-methyl, and sulfometuron-methyl, reported in 1992. Local weed scientists estimate that there are 1,130 sites and more than 66,000 acres infested with herbicide resistant weeds in Oklahoma and they infest corn, roadsides, soybean, and wheat. The most widespread resistant weed of Oklahoma is Kochia (Kochia scoparia), which infests an estimated 10001-100000 acres and is found primarily in roadsides, and wheat. Common Waterhemp (Amaranthus rudis), with resistance to chlorimuron-ethyl, imazaquin, imazethapyr, nicosulfuron, and primisulfuron-methyl is the most recently discovered (2002) new type of resistant weed in Oklahoma. |
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This is a resource page to assist you in
managing herbicide-resistant weeds in Oklahoma . If you have any questions regarding herbicide-resistant
weeds in Oklahoma please contact an
expert in your area. If you have encountered a computer related error on the site then contact
support@weedscience.org. If you are a weed scientist wanting to add or correct information on this page then please contact
research@weedscience.org
or add the
information directly.
Scroll down this page to view tables on
herbicide resistant weeds in Oklahoma and its adjacent states as well as a list of articles about
herbicide resistant weeds in your region. Click on the links within
the table to view a case of resistance in more detail.
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Kochia (Kochia scoparia) is the most widespread resistant weed of Oklahoma