International Survey of Herbicide-Resistant Weeds

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Status of Herbicide Resistance in Illinois - Patrick Tranel : January, 2014

Herbicide resistance in common waterhemp is the most prevalent, and includes resistances to triazines, ALS inhibitors, PPO inhibitors, glyphosate, and HPPD inhibitors. Resistance to HPPD inhibitors is still relatively isolated and uncommon in the state, whereas resistances to herbicides from the other four SOAs are common and widespread throughout much of the state. Numerous waterhemp populations (and even individual plants) possess various combinations of multiple resistances; the current worst-case scenario is resistances to herbicides spanning four SOAs within the same plant. The next most commonly encountered HR weed in Illinois is horseweed. In this species, resistances to glyphosate and ALS inhibitors are thought to be common and widespread throughout Illinois. However, unlike the case with waterhemp, our knowledge of the resistance status in horseweed is based more on anecdotal observations and less on empirical data. Maybe of greatest concern is increasing occurrence of Palmer amaranth populations in Illinois, many of which contain resistances to glyphosate and/or ALS inhibitors.

Herbicide Resistant Weeds in Illinois, United States.
#YearSpeciesSite of ActionActivesContacts
1 237Common Lambsquarters1985Chenopodium album
Common Lambsquarters
United States
(Illinois)
IllinoisIL Photosystem II inhibitors (C1/5) Photosystem II inhibitors (C1/5) atrazine Patrick Tranel
2 238Kochia1992Kochia scoparia
Kochia
United States
(Illinois)
IllinoisIL Photosystem II inhibitors (C1/5) Photosystem II inhibitors (C1/5) atrazine Patrick Tranel
3 236Smooth Pigweed1993Amaranthus hybridus (syn: quitensis)
Smooth Pigweed
United States
(Illinois)
IllinoisIL Photosystem II inhibitors (C1/5) Photosystem II inhibitors (C1/5) atrazine Patrick Tranel
4 5183Tall Waterhemp1993Amaranthus tuberculatus (=A. rudis)
Tall Waterhemp
United States
(Illinois)
Illinois  ALS inhibitors (B/2) ALS inhibitors (B/2) chlorimuron-ethyl, imazethapyr, thifensulfuron-methyl Patrick Tranel
5 1126Kochia1995Kochia scoparia
Kochia
United States
(Illinois)
IllinoisIL ALS inhibitors (B/2), Photosystem II inhibitors (C1/5) Multiple Resistance: 2 Sites of Action
ALS inhibitors (B/2)
Photosystem II inhibitors (C1/5)
atrazine, metsulfuron-methyl Patrick Tranel
6 1127Tall Waterhemp1996Amaranthus tuberculatus (=A. rudis)
Tall Waterhemp
United States
(Illinois)
IllinoisIL ALS inhibitors (B/2), Photosystem II inhibitors (C1/5) Multiple Resistance: 2 Sites of Action
ALS inhibitors (B/2)
Photosystem II inhibitors (C1/5)
atrazine, flumetsulam, imazethapyr, thifensulfuron-methyl Patrick Tranel
7 1114Common Ragweed1998Ambrosia artemisiifolia
Common Ragweed
United States
(Illinois)
Illinois  ALS inhibitors (B/2) ALS inhibitors (B/2) cloransulam-methyl, imazethapyr Patrick Tranel
8 1124Giant Ragweed1998Ambrosia trifida
Giant Ragweed
United States
(Illinois)
Illinois  ALS inhibitors (B/2) ALS inhibitors (B/2) cloransulam-methyl, imazethapyr Patrick Tranel
9 7858Common cocklebur1998Xanthium strumarium
Common cocklebur
United States
(Illinois)
Illinois  ALS inhibitors (B/2) ALS inhibitors (B/2) chlorimuron-ethyl, imazethapyr Aaron Hager
10 7859Smooth Pigweed1998Amaranthus hybridus (syn: quitensis)
Smooth Pigweed
United States
(Illinois)
Illinois  ALS inhibitors (B/2) ALS inhibitors (B/2) imazethapyr, primisulfuron-methyl Aaron Hager
11 7863Giant Foxtail1998Setaria faberi
Giant Foxtail
United States
(Illinois)
Illinois  ACCase inhibitors (A/1) ACCase inhibitors (A/1) clethodim, fluazifop-P-butyl Aaron Hager
12 5184Eastern Black Nightshade1999Solanum ptycanthum
Eastern Black Nightshade
United States
(Illinois)
Illinois  ALS inhibitors (B/2) ALS inhibitors (B/2) imazamox, imazethapyr Dean Riechers, F. William Simmons
13 7860Smooth Pigweed2000Amaranthus hybridus (syn: quitensis)
Smooth Pigweed
United States
(Illinois)
Illinois  ALS inhibitors (B/2), Photosystem II inhibitors (C1/5) Multiple Resistance: 2 Sites of Action
ALS inhibitors (B/2)
Photosystem II inhibitors (C1/5)
atrazine, imazethapyr, primisulfuron-methyl Aaron Hager
14 7861Shattercane2000Sorghum bicolor
Shattercane
United States
(Illinois)
Illinois  ALS inhibitors (B/2) ALS inhibitors (B/2) nicosulfuron Aaron Hager
15 5182Tall Waterhemp2001Amaranthus tuberculatus (=A. rudis)
Tall Waterhemp
United States
(Illinois)
Illinois  Photosystem II inhibitors (C1/5) Photosystem II inhibitors (C1/5) atrazine, cyanazine Patrick Tranel
16 5171Tall Waterhemp2002Amaranthus tuberculatus (=A. rudis)
Tall Waterhemp
United States
(Illinois)
Illinois  ALS inhibitors (B/2), Photosystem II inhibitors (C1/5), PPO inhibitors (E/14) Multiple Resistance: 3 Sites of Action
ALS inhibitors (B/2)
Photosystem II inhibitors (C1/5)
PPO inhibitors (E/14)
acifluorfen-sodium, atrazine, fomesafen, imazamox, lactofen, thifensulfuron-methyl Patrick Tranel
17 5276Horseweed2005Conyza canadensis
Horseweed
United States
(Illinois)
Illinois  EPSP synthase inhibitors (G/9) EPSP synthase inhibitors (G/9) glyphosate Aaron Hager
18 5311Tall Waterhemp2006Amaranthus tuberculatus (=A. rudis)
Tall Waterhemp
United States
(Illinois)
Illinois  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, imazethapyr Aaron Hager
19 7862Giant Foxtail2007Setaria faberi
Giant Foxtail
United States
(Illinois)
Illinois  ALS inhibitors (B/2) ALS inhibitors (B/2) imazethapyr, nicosulfuron Aaron Hager
20 5491Tall Waterhemp2009Amaranthus tuberculatus (=A. rudis)
Tall Waterhemp
United States
(Illinois)
Illinois  ALS inhibitors (B/2), HPPD inhibitors (F2/27), Photosystem II inhibitors (C1/5) Multiple Resistance: 3 Sites of Action
ALS inhibitors (B/2)
HPPD inhibitors (F2/27)
Photosystem II inhibitors (C1/5)
atrazine, chlorimuron-ethyl, imazethapyr, mesotrione, tembotrione, topramezone Aaron Hager
21 7864Tall Waterhemp2009Amaranthus tuberculatus (=A. rudis)
Tall Waterhemp
United States
(Illinois)
Illinois  ALS inhibitors (B/2), EPSP synthase inhibitors (G/9), Photosystem II inhibitors (C1/5), PPO inhibitors (E/14) Multiple Resistance: 4 Sites of Action
ALS inhibitors (B/2)
EPSP synthase inhibitors (G/9)
Photosystem II inhibitors (C1/5)
PPO inhibitors (E/14)
atrazine, chlorimuron-ethyl, glyphosate, imazethapyr, lactofen Patrick Tranel
22 5543Palmer Amaranth2010Amaranthus palmeri
Palmer Amaranth
United States
(Illinois)
Illinois  EPSP synthase inhibitors (G/9) EPSP synthase inhibitors (G/9) glyphosate Aaron Hager
23 7865Horseweed2013Conyza canadensis
Horseweed
United States
(Illinois)
Illinois  ALS inhibitors (B/2) ALS inhibitors (B/2) cloransulam-methyl Aaron Hager
24 7866Palmer Amaranth2013Amaranthus palmeri
Palmer Amaranth
United States
(Illinois)
Illinois  ALS inhibitors (B/2) ALS inhibitors (B/2) imazethapyr, primisulfuron-methyl Patrick Tranel
25 7867Palmer Amaranth2013Amaranthus palmeri
Palmer Amaranth
United States
(Illinois)
Illinois  ALS inhibitors (B/2), EPSP synthase inhibitors (G/9) Multiple Resistance: 2 Sites of Action
ALS inhibitors (B/2)
EPSP synthase inhibitors (G/9)
glyphosate, imazethapyr, primisulfuron-methyl Patrick Tranel
26 13050Palmer Amaranth2016Amaranthus palmeri
Palmer Amaranth
United States
(Illinois)
Illinois  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, lactofen Patrick Tranel, Karla Gage, Ronald Krausz
27 14051Tall Waterhemp2016Amaranthus tuberculatus (=A. rudis)
Tall Waterhemp
United States
(Illinois)
Illinois  ALS inhibitors (B/2), HPPD inhibitors (F2/27), Photosystem II inhibitors (C1/5), PPO inhibitors (E/14), Synthetic Auxins (O/4) Multiple Resistance: 5 Sites of Action
ALS inhibitors (B/2)
HPPD inhibitors (F2/27)
Photosystem II inhibitors (C1/5)
PPO inhibitors (E/14)
Synthetic Auxins (O/4)
2,4-D, acifluorfen-sodium, atrazine, chlorimuron-ethyl, fomesafen, imazethapyr, lactofen, mesotrione, tembotrione, topramezone Patrick Tranel, Dean Riechers, Aaron Hager, Adam Davis
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Cite this site as: Heap, I.  The International Survey of Herbicide Resistant Weeds.  Online.  Internet.  Monday, December 18, 2017 .  Available  www.weedscience.org
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