| There are currently 9 different types (known as 'biotypes') of herbicide resistant weeds in Washington. The first herbicide resistant weed reported from Washington is Common Groundsel (Senecio vulgaris) with resistance to simazine, reported in 1970. Local weed scientists estimate that there are 1,620 sites and more than 17,100 acres infested with herbicide resistant weeds in Washington and they infest cereals, lentils, mint, nurseries, roadsides, and wheat. The most widespread resistant weed of Washington is Russian Thistle (Salsola iberica), which infests an estimated 1001-10000 acres and is found primarily in wheat. Prickly Lettuce (Lactuca serriola), with resistance to 2,4-D, dicamba, and MCPA is the most recently discovered (2007) new type of resistant weed in Washington. |
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This is a resource page to assist you in
managing herbicide-resistant weeds in Washington . If you have any questions regarding herbicide-resistant
weeds in Washington 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 Washington 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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Russian Thistle (Salsola iberica) is the most widespread resistant weed of Washington