International Survey of Herbicide-Resistant Weeds

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Status of Herbicide Resistance in Tennessee - James Brosnan : January, 2014

Occurrences of weed biotypes exhibiting resistance to both PRE and POST herbicides in managed turfgrass have been identified at an increasing rate since 2012. This is a growing concern throughout the industry and will be monitored closely over the next several years. Further, efforts are being made to educate turf managers about integrated weed management strategies to curb the rate of resistance development while the overall magnitude of the problem in Tennessee is still quite small.
Herbicide Resistant Weeds in Tennessee, United States.
#YearSpeciesSite of ActionActivesContacts
1 1103Goosegrass1988Eleusine indica
Goosegrass		United States
(Tennessee)		Tennessee  Inhibition of Microtubule Assembly (K1/3) Inhibition of Microtubule Assembly (K1/3) pendimethalin, prodiamine, trifluralin Neil Rhodes, James Brosnan
2 1104Common cocklebur1991Xanthium strumarium
Common cocklebur		United States
(Tennessee)		TennesseeTN Nucleic acid inhibitors (Z/17) Nucleic acid inhibitors (Z/17) DSMA, MSMA Neil Rhodes
3 1105Common cocklebur1992Xanthium strumarium
Common cocklebur		United States
(Tennessee)		TennesseeTN Inhibition of Acetolactate Synthase (B/2) Inhibition of Acetolactate Synthase (B/2) imazaquin Neil Rhodes
4 5313Palmer Amaranth1994Amaranthus palmeri
Palmer Amaranth		United States
(Tennessee)		Tennessee  Inhibition of Acetolactate Synthase (B/2) Inhibition of Acetolactate Synthase (B/2) imazaquin, pyrithiobac-sodium Larry Steckel
5 1106Johnsongrass1995Sorghum halepense
Johnsongrass		United States
(Tennessee)		TennesseeTN Inhibition of Acetyl CoA Carboxylase (A/1) Inhibition of Acetyl CoA Carboxylase (A/1) fluazifop-butyl, quizalofop-ethyl Neil Rhodes
6 1107Common Lambsquarters1998Chenopodium album
Common Lambsquarters		United States
(Tennessee)		TennesseeTN PSII inhibitors - Serine 264 Binders (C1 C2/5) PSII inhibitors - Serine 264 Binders (C1 C2/5) atrazine Neil Rhodes
7 5569Palmer Amaranth1998Amaranthus palmeri
Palmer Amaranth		United States
(Tennessee)		TennesseeTennessee Inhibition of Microtubule Assembly (K1/3) Inhibition of Microtubule Assembly (K1/3) trifluralin Larry Steckel
8 5122Horseweed2001Conyza canadensis
Horseweed		United States
(Tennessee)		Tennessee  Inhibition of Enolpyruvyl Shikimate Phosphate Synthase (G/9) Inhibition of Enolpyruvyl Shikimate Phosphate Synthase (G/9) glyphosate Neil Rhodes, Larry Steckel
9 5316Italian Ryegrass2006Lolium perenne ssp. multiflorum
Italian Ryegrass		United States
(Tennessee)		Tennessee  Inhibition of Acetyl CoA Carboxylase (A/1) Inhibition of Acetyl CoA Carboxylase (A/1) diclofop-methyl Larry Steckel
10 5387Palmer Amaranth2006Amaranthus palmeri
Palmer Amaranth		United States
(Tennessee)		Tennessee  Inhibition of Enolpyruvyl Shikimate Phosphate Synthase (G/9) Inhibition of Enolpyruvyl Shikimate Phosphate Synthase (G/9) glyphosate Larry Steckel
11 5335Giant Ragweed2007Ambrosia trifida
Giant Ragweed		United States
(Tennessee)		Tennessee  Inhibition of Enolpyruvyl Shikimate Phosphate Synthase (G/9) Inhibition of Enolpyruvyl Shikimate Phosphate Synthase (G/9) glyphosate Jason Norsworthy, Larry Steckel
12 5314Tall Waterhemp2007Amaranthus tuberculatus (=A. rudis)
Tall Waterhemp		United States
(Tennessee)		Tennessee  Inhibition of Acetolactate Synthase (B/2) Inhibition of Acetolactate Synthase (B/2) cloransulam-methyl Larry Steckel
13 5645Annual Bluegrass2007Poa annua
Annual Bluegrass		United States
(Tennessee)		Tennessee  Inhibition of Microtubule Assembly (K1/3) Inhibition of Microtubule Assembly (K1/3) dithiopyr, pendimethalin, prodiamine Scott Mcelroy, James Brosnan
14 5571Palmer Amaranth2009Amaranthus palmeri
Palmer Amaranth		United States
(Tennessee)		TennesseeTennessee Inhibition of Acetolactate Synthase (B/2), Inhibition of Enolpyruvyl Shikimate Phosphate Synthase (G/9) Multiple Resistance: 2 Sites of Action
Inhibition of Acetolactate Synthase (B/2)
Inhibition of Enolpyruvyl Shikimate Phosphate Synthase (G/9) 		chlorimuron-ethyl, glyphosate, pyrithiobac-sodium Larry Steckel
15 5595Tall Waterhemp2011Amaranthus tuberculatus (=A. rudis)
Tall Waterhemp		United States
(Tennessee)		Tennessee  Inhibition of Enolpyruvyl Shikimate Phosphate Synthase (G/9) Inhibition of Enolpyruvyl Shikimate Phosphate Synthase (G/9) glyphosate Larry Steckel
16 5596Annual Bluegrass2011Poa annua
Annual Bluegrass		United States
(Tennessee)		Tennessee  Inhibition of Enolpyruvyl Shikimate Phosphate Synthase (G/9) Inhibition of Enolpyruvyl Shikimate Phosphate Synthase (G/9) glyphosate Larry Steckel, James Brosnan
17 5549Goosegrass2011Eleusine indica
Goosegrass		United States
(Tennessee)		Tennessee  Inhibition of Enolpyruvyl Shikimate Phosphate Synthase (G/9) Inhibition of Enolpyruvyl Shikimate Phosphate Synthase (G/9) glyphosate Larry Steckel
18 6753Italian Ryegrass2012Lolium perenne ssp. multiflorum
Italian Ryegrass		United States
(Tennessee)		Tennessee  Inhibition of Enolpyruvyl Shikimate Phosphate Synthase (G/9) Inhibition of Enolpyruvyl Shikimate Phosphate Synthase (G/9) glyphosate Larry Steckel
19 6765Annual Bluegrass2013Poa annua
Annual Bluegrass		United States
(Tennessee)		Tennessee  Inhibition of Acetolactate Synthase (B/2), PSII inhibitors - Serine 264 Binders (C1 C2/5) Multiple Resistance: 2 Sites of Action
Inhibition of Acetolactate Synthase (B/2)
PSII inhibitors - Serine 264 Binders (C1 C2/5) 		foramsulfuron, simazine, trifloxysulfuron-Na James Brosnan
20 13037Palmer Amaranth2015Amaranthus palmeri
Palmer Amaranth		United States
(Tennessee)		Tennessee  Inhibition of Enolpyruvyl Shikimate Phosphate Synthase (G/9), Inhibition of Protoporphyrinogen Oxidase (E/14) Multiple Resistance: 2 Sites of Action
Inhibition of Enolpyruvyl Shikimate Phosphate Synthase (G/9)
Inhibition of Protoporphyrinogen Oxidase (E/14) 		fomesafen, glyphosate Patrick Tranel, Larry Steckel, R. Joseph Wuerffel, Garret Montgomery
21 23237Annual Bluegrass2017Poa annua
Annual Bluegrass		United States
(Tennessee)		Tennessee  Inhibition of Acetolactate Synthase (B/2), Inhibition of Cellulose Synthesis (L/29), Inhibition of Enolpyruvyl Shikimate Phosphate Synthase (G/9), Inhibition of Glutamine Synthetase (H/10), Inhibition of Microtubule Assembly (K1/3), Inhibition of Protoporphyrinogen Oxidase (E/14), PSII inhibitors - Serine 264 Binders (C1 C2/5) Multiple Resistance: 7 Sites of Action
Inhibition of Acetolactate Synthase (B/2)
Inhibition of Cellulose Synthesis (L/29)
Inhibition of Enolpyruvyl Shikimate Phosphate Synthase (G/9)
Inhibition of Glutamine Synthetase (H/10)
Inhibition of Microtubule Assembly (K1/3)
Inhibition of Protoporphyrinogen Oxidase (E/14)
PSII inhibitors - Serine 264 Binders (C1 C2/5) 		flumioxazin, foramsulfuron, glufosinate-ammonium, glyphosate, Indaziflam, metribuzin, prodiamine, propyzamide/pronamide, simazine James Brosnan, Jinyi Chen
22 19221Palmer Amaranth2020Amaranthus palmeri
Palmer Amaranth		United States
(Tennessee)		Tennessee  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, glyphosate Larry Steckel, Peter Dotray
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Cite this site as: Heap, I.  The International Survey of Herbicide Resistant Weeds.  Online.  Internet.  Wednesday, July 9, 2025 .  Available  www.weedscience.org
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