International Survey of Herbicide-Resistant Weeds

Countries Weeds Herbicides Mutations Graphs References Researchers
select

Status of Herbicide Resistance in Kansas - Dallas Peterson : January, 2014

Herbicide resistance is a major issue in Kansas, with documented resistance in 13 species to five different herbicide sites of action. Weed resistance to PSII inhibitors, ALS-inhibitors, and glyphosate are most common. Multiple resistance has been documented in some cases and is a primary concern. Weed species with documented resistance to multiple classes of herbicides include Palmer amaranth, waterhemp, kochia, and horseweed.

Herbicide Resistant Weeds in Kansas, United States.
#YearSpeciesSite of ActionActivesContacts
1 1070Kochia1976Kochia scoparia
Kochia		United States
(Kansas)		KansasKS PSII inhibitors - Serine 264 Binders (C1 C2/5) PSII inhibitors - Serine 264 Binders (C1 C2/5) atrazine Dallas Peterson
2 1042Kochia1987Kochia scoparia
Kochia		United States
(Kansas)		Kansas  Inhibition of Acetolactate Synthase (B/2) Inhibition of Acetolactate Synthase (B/2) chlorsulfuron Curtis Thompson
3 332Palmer Amaranth1993Amaranthus palmeri
Palmer Amaranth		United States
(Kansas)		Kansas  Inhibition of Acetolactate Synthase (B/2) Inhibition of Acetolactate Synthase (B/2) imazethapyr Dallas Peterson
4 333Tall Waterhemp1995Amaranthus tuberculatus (=A. rudis)
Tall Waterhemp		United States
(Kansas)		Kansas  Inhibition of Acetolactate Synthase (B/2) Inhibition of Acetolactate Synthase (B/2) imazethapyr, thifensulfuron-methyl Dallas Peterson
5 1038Tall Waterhemp1995Amaranthus tuberculatus (=A. rudis)
Tall Waterhemp		United States
(Kansas)		Kansas  PSII inhibitors - Serine 264 Binders (C1 C2/5) PSII inhibitors - Serine 264 Binders (C1 C2/5) atrazine Dallas Peterson
6 1039Redroot Pigweed1995Amaranthus retroflexus
Redroot Pigweed		United States
(Kansas)		Kansas  PSII inhibitors - Serine 264 Binders (C1 C2/5) PSII inhibitors - Serine 264 Binders (C1 C2/5) atrazine Kassim Al-Khatib, Curtis Thompson
7 1040Palmer Amaranth1995Amaranthus palmeri
Palmer Amaranth		United States
(Kansas)		Kansas  PSII inhibitors - Serine 264 Binders (C1 C2/5) PSII inhibitors - Serine 264 Binders (C1 C2/5) atrazine Curtis Thompson, Dallas Peterson
8 499Common Sunflower1996Helianthus annuus
Common Sunflower		United States
(Kansas)		Kansas  Inhibition of Acetolactate Synthase (B/2) Inhibition of Acetolactate Synthase (B/2) imazethapyr Kassim Al-Khatib, Dallas Peterson
9 500Shattercane1996Sorghum bicolor
Shattercane		United States
(Kansas)		Kansas  Inhibition of Acetolactate Synthase (B/2) Inhibition of Acetolactate Synthase (B/2) imazamox, nicosulfuron, primisulfuron-methyl Curtis Thompson, Dallas Peterson, Vipan Kumar
10 1041Common cocklebur1997Xanthium strumarium
Common cocklebur		United States
(Kansas)		Kansas  Inhibition of Acetolactate Synthase (B/2) Inhibition of Acetolactate Synthase (B/2) chlorimuron-ethyl, imazethapyr Dallas Peterson
11 5112Tall Waterhemp2001Amaranthus tuberculatus (=A. rudis)
Tall Waterhemp		United States
(Kansas)		Kansas  Inhibition of Acetolactate Synthase (B/2), Inhibition of Protoporphyrinogen Oxidase (E/14) Multiple Resistance: 2 Sites of Action
Inhibition of Acetolactate Synthase (B/2)
Inhibition of Protoporphyrinogen Oxidase (E/14) 		acifluorfen, chlorimuron-ethyl, fomesafen, imazethapyr, lactofen, thifensulfuron-methyl Kassim Al-Khatib, Dallas Peterson
12 5308Horseweed2005Conyza canadensis
Horseweed		United States
(Kansas)		KansasKansas Inhibition of Enolpyruvyl Shikimate Phosphate Synthase (G/9) Inhibition of Enolpyruvyl Shikimate Phosphate Synthase (G/9) glyphosate Kassim Al-Khatib, Dallas Peterson
13 5448Bushy Wallflower2005Erysimum repandum
Bushy Wallflower		United States
(Kansas)		Kansas  Inhibition of Acetolactate Synthase (B/2) Inhibition of Acetolactate Synthase (B/2) chlorsulfuron, imazamox, metsulfuron-methyl, propoxycarbazone-Na, sulfosulfuron, triasulfuron, tribenuron-methyl Dallas Peterson
14 5307Tall Waterhemp2006Amaranthus tuberculatus (=A. rudis)
Tall Waterhemp		United States
(Kansas)		Kansas  Inhibition of Enolpyruvyl Shikimate Phosphate Synthase (G/9) Inhibition of Enolpyruvyl Shikimate Phosphate Synthase (G/9) glyphosate Kassim Al-Khatib, Dallas Peterson
15 5404Flixweed2006Descurainia sophia
Flixweed		United States
(Kansas)		Kansas  Inhibition of Acetolactate Synthase (B/2) Inhibition of Acetolactate Synthase (B/2) chlorsulfuron, imazamox, metsulfuron-methyl, pyroxsulam, sulfosulfuron, triasulfuron, tribenuron-methyl Dallas Peterson
16 5304Giant Ragweed2006Ambrosia trifida
Giant Ragweed		United States
(Kansas)		Kansas  Inhibition of Enolpyruvyl Shikimate Phosphate Synthase (G/9) Inhibition of Enolpyruvyl Shikimate Phosphate Synthase (G/9) glyphosate Kassim Al-Khatib, Dallas Peterson
17 5305Common Ragweed2007Ambrosia artemisiifolia
Common Ragweed		United States
(Kansas)		Kansas  Inhibition of Enolpyruvyl Shikimate Phosphate Synthase (G/9) Inhibition of Enolpyruvyl Shikimate Phosphate Synthase (G/9) glyphosate Kassim Al-Khatib, Dallas Peterson
18 5446Cheat (Rye Brome)2007Bromus secalinus
Cheat (Rye Brome)		United States
(Kansas)		Kansas  Inhibition of Acetolactate Synthase (B/2) Inhibition of Acetolactate Synthase (B/2) imazamox, propoxycarbazone-Na, pyroxsulam, sulfosulfuron Dallas Peterson
19 5447Japanese Brome2007Bromus japonicus
Japanese Brome		United States
(Kansas)		Kansas  Inhibition of Acetolactate Synthase (B/2) Inhibition of Acetolactate Synthase (B/2) imazamox, propoxycarbazone-Na, pyroxsulam, sulfosulfuron Dallas Peterson
20 5470Kochia2007Kochia scoparia
Kochia		United States
(Kansas)		Kansas  Inhibition of Enolpyruvyl Shikimate Phosphate Synthase (G/9) Inhibition of Enolpyruvyl Shikimate Phosphate Synthase (G/9) glyphosate Curtis Thompson, Phillip Stahlman
21 5705Palmer Amaranth2009Amaranthus palmeri
Palmer Amaranth		United States
(Kansas)		Kansas  Inhibition of Acetolactate Synthase (B/2), Inhibition of Hydroxyphenyl Pyruvate Dioxygenase (F2/27), PSII inhibitors - Serine 264 Binders (C1 C2/5) Multiple Resistance: 3 Sites of Action
Inhibition of Acetolactate Synthase (B/2)
Inhibition of Hydroxyphenyl Pyruvate Dioxygenase (F2/27)
PSII inhibitors - Serine 264 Binders (C1 C2/5) 		atrazine, mesotrione, pyrasulfotole, tembotrione, thifensulfuron-methyl, topramezone Curtis Thompson
22 7806Horseweed2011Conyza canadensis
Horseweed		United States
(Kansas)		Kansas  Inhibition of Acetolactate Synthase (B/2) Inhibition of Acetolactate Synthase (B/2) chlorsulfuron, iodosulfuron-methyl-Na, metsulfuron-methyl, rimsulfuron, thiencarbazone-methyl, thifensulfuron-methyl, tribenuron-methyl Dallas Peterson
23 5704Palmer Amaranth2011Amaranthus palmeri
Palmer Amaranth		United States
(Kansas)		Kansas  Inhibition of Enolpyruvyl Shikimate Phosphate Synthase (G/9) Inhibition of Enolpyruvyl Shikimate Phosphate Synthase (G/9) glyphosate Dallas Peterson
24 10972Kochia2013Kochia scoparia
Kochia		United States
(Kansas)		Kansas  Auxin Mimics (O/4), Inhibition of Acetolactate Synthase (B/2), Inhibition of Enolpyruvyl Shikimate Phosphate Synthase (G/9), PSII inhibitors - Serine 264 Binders (C1 C2/5) Multiple Resistance: 4 Sites of Action
Auxin Mimics (O/4)
Inhibition of Acetolactate Synthase (B/2)
Inhibition of Enolpyruvyl Shikimate Phosphate Synthase (G/9)
PSII inhibitors - Serine 264 Binders (C1 C2/5) 		atrazine, chlorsulfuron, dicamba, glyphosate Randall Currie, Amar Godar, Vijay Varanasi, Mithila Jugulam
25 10973Kochia2013Kochia scoparia
Kochia		United States
(Kansas)		Kansas  Auxin Mimics (O/4), Inhibition of Enolpyruvyl Shikimate Phosphate Synthase (G/9) Multiple Resistance: 2 Sites of Action
Auxin Mimics (O/4)
Inhibition of Enolpyruvyl Shikimate Phosphate Synthase (G/9) 		dicamba, fluroxypyr, glyphosate Randall Currie, Phillip Stahlman, David Brachtenbach, Vipan Kumar
26 10970Henbit Deadnettle2014Lamium amplexicaule
Henbit Deadnettle		United States
(Kansas)		Kansas  Inhibition of Acetolactate Synthase (B/2) Inhibition of Acetolactate Synthase (B/2) chlorsulfuron, propoxycarbazone-Na Dallas Peterson, Amar Godar, Vijay Varanasi, Doug Shoup, Mithila Jugulam
27 18157Palmer Amaranth2015Amaranthus palmeri
Palmer Amaranth		United States
(Kansas)		Kansas  Auxin Mimics (O/4), Inhibition of Acetolactate Synthase (B/2), Inhibition of Enolpyruvyl Shikimate Phosphate Synthase (G/9), Inhibition of Hydroxyphenyl Pyruvate Dioxygenase (F2/27), PSII inhibitors - Serine 264 Binders (C1 C2/5) Multiple Resistance: 5 Sites of Action
Auxin Mimics (O/4)
Inhibition of Acetolactate Synthase (B/2)
Inhibition of Enolpyruvyl Shikimate Phosphate Synthase (G/9)
Inhibition of Hydroxyphenyl Pyruvate Dioxygenase (F2/27)
PSII inhibitors - Serine 264 Binders (C1 C2/5) 		2,4-D, atrazine, chlorsulfuron, glyphosate, mesotrione Phillip Stahlman, Vipan Kumar, Rui Liu
28 18151Palmer Amaranth2018Amaranthus palmeri
Palmer Amaranth		United States
(Kansas)		Kansas  Auxin Mimics (O/4) Auxin Mimics (O/4) 2,4-D Dallas Peterson, Mithila Jugulam, Chandrima Shyam
29 31269Wild Buckwheat2020Polygonum convolvulus (=Fallopia convolvulus)
Wild Buckwheat		United States
(Kansas)		Kansas  Inhibition of Acetolactate Synthase (B/2) Inhibition of Acetolactate Synthase (B/2) chlorsulfuron Dallas Peterson, Mithila Jugulam, Balaji Aravindhan Pandian
30 24257Palmer Amaranth2021Amaranthus palmeri
Palmer Amaranth		United States
(Kansas)		Kansas  Auxin Mimics (O/4), Inhibition of Acetolactate Synthase (B/2), Inhibition of Enolpyruvyl Shikimate Phosphate Synthase (G/9), Inhibition of Hydroxyphenyl Pyruvate Dioxygenase (F2/27), Inhibition of Protoporphyrinogen Oxidase (E/14), PSII inhibitors - Serine 264 Binders (C1 C2/5) Multiple Resistance: 6 Sites of Action
Auxin Mimics (O/4)
Inhibition of Acetolactate Synthase (B/2)
Inhibition of Enolpyruvyl Shikimate Phosphate Synthase (G/9)
Inhibition of Hydroxyphenyl Pyruvate Dioxygenase (F2/27)
Inhibition of Protoporphyrinogen Oxidase (E/14)
PSII inhibitors - Serine 264 Binders (C1 C2/5) 		2,4-D, atrazine, chlorsulfuron, fomesafen, glyphosate, imazamox, imazethapyr, lactofen, mesotrione, metribuzin, pyrasulfotole, tembotrione, thifensulfuron-methyl Dallas Peterson, Mithila Jugulam, Ednaldo Alexandre Borgato, Chandrima Shyam, Anita Dille
31 32273Italian Ryegrass2023Lolium perenne ssp. multiflorum
Italian Ryegrass		United States
(Kansas)		Kansas  Inhibition of Enolpyruvyl Shikimate Phosphate Synthase (G/9) Inhibition of Enolpyruvyl Shikimate Phosphate Synthase (G/9) glyphosate Jason Norsworthy, Jatinder Aulakh, Vipan Kumar
Contributing Weed Scientists
12
Page size:
select
Page: of 2
Items 1 to 10 of 15
PERMISSION MUST BE OBTAINED FIRST if you intend to base a significant portion of a scientific paper on data derived from this site.
Cite this site as: Heap, I.  The International Survey of Herbicide Resistant Weeds.  Online.  Internet.  Friday, July 25, 2025 .  Available  www.weedscience.org
Copyright � 1993- 2025 WeedScience.org All rights reserved. Fair use of this material is encouraged. Proper citation is requested.