International Survey of Herbicide-Resistant Weeds

Countries Weeds Herbicides Mutations Graphs References Researchers
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Status of Herbicide Resistance in Colorado - Sarah Ward : January, 2014

The biggest concern in Colorado right now is glyphosate-resistant kochia, especially as ALS-resistant kochia is widespread, dicamba resistant kochia is also present in the state. and it's highly likely that kochia populations with stacked multiple resistances are out there. There have also been sporadic reports of possible glyphosate resistance in lambsquarters. We are seeing a few Palmer amaranth populations moving into Colorado, which is a concern given the known frequency of resistance in this species.

Herbicide Resistant Weeds in Colorado, United States.
#YearSpeciesSite of ActionActivesContacts
1 430Redroot Pigweed1982Amaranthus retroflexus
Redroot Pigweed
United States
(Colorado)
ColoradoCO Photosystem II inhibitors (C1/5) Photosystem II inhibitors (C1/5) atrazine Phillip Westra
2 431Kochia1982Kochia scoparia
Kochia
United States
(Colorado)
ColoradoCO Photosystem II inhibitors (C1/5) Photosystem II inhibitors (C1/5) atrazine Phillip Westra
3 1049Kochia1989Kochia scoparia
Kochia
United States
(Colorado)
ColoradoCO ALS inhibitors (B/2) ALS inhibitors (B/2) metsulfuron-methyl, triasulfuron Phillip Westra
4 1052Wild Oat1997Avena fatua
Wild Oat
United States
(Colorado)
ColoradoCO ACCase inhibitors (A/1) ACCase inhibitors (A/1) diclofop-methyl Phillip Westra
5 7868Kochia1999Kochia scoparia
Kochia
United States
(Colorado)
Colorado  Synthetic Auxins (O/4) Synthetic Auxins (O/4) dicamba Phillip Westra
6 5714Kochia2012Kochia scoparia
Kochia
United States
(Colorado)
Colorado  EPSP synthase inhibitors (G/9) EPSP synthase inhibitors (G/9) glyphosate Phillip Westra
Contributing Weed Scientists
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