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  Microtubule inhibitors (K1/3) Microtubule inhibitors (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 ALS inhibitors (B/2) ALS inhibitors (B/2) imazaquin Neil Rhodes
4 5313Palmer Amaranth1994Amaranthus palmeri
Palmer Amaranth
United States
(Tennessee)
Tennessee  ALS inhibitors (B/2) ALS inhibitors (B/2) imazaquin, pyrithiobac-sodium Larry Steckel
5 1106Johnsongrass1995Sorghum halepense
Johnsongrass
United States
(Tennessee)
TennesseeTN ACCase inhibitors (A/1) ACCase inhibitors (A/1) fluazifop-P-butyl, quizalofop-P-ethyl Neil Rhodes
6 1107Common Lambsquarters1998Chenopodium album
Common Lambsquarters
United States
(Tennessee)
TennesseeTN Photosystem II inhibitors (C1/5) Photosystem II inhibitors (C1/5) atrazine Neil Rhodes
7 5569Palmer Amaranth1998Amaranthus palmeri
Palmer Amaranth
United States
(Tennessee)
TennesseeTennessee Microtubule inhibitors (K1/3) Microtubule inhibitors (K1/3) trifluralin Larry Steckel
8 5122Horseweed2001Conyza canadensis
Horseweed
United States
(Tennessee)
Tennessee  EPSP synthase inhibitors (G/9) EPSP synthase inhibitors (G/9) glyphosate Neil Rhodes, Larry Steckel
9 5316Italian Ryegrass2006Lolium perenne ssp. multiflorum
Italian Ryegrass
United States
(Tennessee)
Tennessee  ACCase inhibitors (A/1) ACCase inhibitors (A/1) diclofop-methyl Larry Steckel
10 5387Palmer Amaranth2006Amaranthus palmeri
Palmer Amaranth
United States
(Tennessee)
Tennessee  EPSP synthase inhibitors (G/9) EPSP synthase inhibitors (G/9) glyphosate Larry Steckel
11 5335Giant Ragweed2007Ambrosia trifida
Giant Ragweed
United States
(Tennessee)
Tennessee  EPSP synthase inhibitors (G/9) EPSP synthase inhibitors (G/9) glyphosate Jason Norsworthy, Larry Steckel
12 5314Tall Waterhemp2007Amaranthus tuberculatus (=A. rudis)
Tall Waterhemp
United States
(Tennessee)
Tennessee  ALS inhibitors (B/2) ALS inhibitors (B/2) cloransulam-methyl Larry Steckel
13 5645Annual Bluegrass2007Poa annua
Annual Bluegrass
United States
(Tennessee)
Tennessee  Microtubule inhibitors (K1/3) Microtubule inhibitors (K1/3) dithiopyr, pendimethalin, prodiamine Scott Mcelroy, James Brosnan
14 5571Palmer Amaranth2009Amaranthus palmeri
Palmer Amaranth
United States
(Tennessee)
TennesseeTennessee ALS inhibitors (B/2), EPSP synthase inhibitors (G/9) Multiple Resistance: 2 Sites of Action
ALS inhibitors (B/2)
EPSP synthase inhibitors (G/9)
chlorimuron-ethyl, glyphosate, pyrithiobac-sodium Larry Steckel
15 5595Tall Waterhemp2011Amaranthus tuberculatus (=A. rudis)
Tall Waterhemp
United States
(Tennessee)
Tennessee  EPSP synthase inhibitors (G/9) EPSP synthase inhibitors (G/9) glyphosate Larry Steckel
16 5596Annual Bluegrass2011Poa annua
Annual Bluegrass
United States
(Tennessee)
Tennessee  EPSP synthase inhibitors (G/9) EPSP synthase inhibitors (G/9) glyphosate Larry Steckel, James Brosnan
17 5549Goosegrass2011Eleusine indica
Goosegrass
United States
(Tennessee)
Tennessee  EPSP synthase inhibitors (G/9) EPSP synthase inhibitors (G/9) glyphosate Larry Steckel
18 6753Italian Ryegrass2012Lolium perenne ssp. multiflorum
Italian Ryegrass
United States
(Tennessee)
Tennessee  EPSP synthase inhibitors (G/9) EPSP synthase inhibitors (G/9) glyphosate Larry Steckel
19 6765Annual Bluegrass2013Poa annua
Annual Bluegrass
United States
(Tennessee)
Tennessee  ALS inhibitors (B/2), Photosystem II inhibitors (C1/5) Multiple Resistance: 2 Sites of Action
ALS inhibitors (B/2)
Photosystem II inhibitors (C1/5)
foramsulfuron, simazine, trifloxysulfuron-sodium James Brosnan
20 13037Palmer Amaranth2015Amaranthus palmeri
Palmer Amaranth
United States
(Tennessee)
Tennessee  EPSP synthase inhibitors (G/9), PPO inhibitors (E/14) Multiple Resistance: 2 Sites of Action
EPSP synthase inhibitors (G/9)
PPO inhibitors (E/14)
fomesafen, glyphosate Patrick Tranel, Larry Steckel, R. Joseph Wuerffel, Garret Montgomery
Contributing Weed Scientists
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Cite this site as: Heap, I.  The International Survey of Herbicide Resistant Weeds.  Online.  Internet.  Saturday, September 21, 2019 .  Available  www.weedscience.org
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