International Survey of Herbicide-Resistant Weeds

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Status of Herbicide Resistance in Wisconsin - David Stoltenberg : July, 2017

Herbicide resistance in common waterhemp and Palmer amaranth are of greatest concern in Wisconsin. The occurrence of glyphosate-resistant common waterhemp has increased rapidly, having been confirmed in populations from 18 counties, including two populations with multiple resistance to glyphosate and PPO inhibitors. Herbicide-resistant Palmer amaranth has been found in three south-central counties, including two populations with glyphosate resistance, and third population with multiple resistance to ALS- and HPPD-inhibitors.

Herbicide Resistant Weeds in Wisconsin, United States.
#YearSpeciesSite of ActionActivesContacts
1 419Common Lambsquarters1979Chenopodium album
Common Lambsquarters
United States
(Wisconsin)
WisconsinWI Photosystem II inhibitors (C1/5) Photosystem II inhibitors (C1/5) atrazine Jerry Doll (Retired), David Stoltenberg
2 418Smooth Pigweed1985Amaranthus hybridus (syn: quitensis)
Smooth Pigweed
United States
(Wisconsin)
WisconsinWI Photosystem II inhibitors (C1/5) Photosystem II inhibitors (C1/5) atrazine David Stoltenberg
3 416Kochia1987Kochia scoparia
Kochia
United States
(Wisconsin)
WisconsinWI Photosystem II inhibitors (C1/5) Photosystem II inhibitors (C1/5) atrazine David Stoltenberg
4 410Velvetleaf1990Abutilon theophrasti
Velvetleaf
United States
(Wisconsin)
WisconsinWI Photosystem II inhibitors (C1/5) Photosystem II inhibitors (C1/5) atrazine David Stoltenberg
5 415Giant Foxtail1991Setaria faberi
Giant Foxtail
United States
(Wisconsin)
WisconsinWI ACCase inhibitors (A/1) ACCase inhibitors (A/1) fluazifop-P-butyl, sethoxydim David Stoltenberg
6 417Large Crabgrass1992Digitaria sanguinalis
Large Crabgrass
United States
(Wisconsin)
WisconsinWI ACCase inhibitors (A/1) ACCase inhibitors (A/1) fluazifop-P-butyl, sethoxydim David Stoltenberg
7 1169Kochia1995Kochia scoparia
Kochia
United States
(Wisconsin)
WisconsinWI ALS inhibitors (B/2) ALS inhibitors (B/2) sulfometuron-methyl Jerry Doll (Retired), David Stoltenberg
8 1170Eastern Black Nightshade1999Solanum ptycanthum
Eastern Black Nightshade
United States
(Wisconsin)
WisconsinWI ALS inhibitors (B/2) ALS inhibitors (B/2) imazamox, imazethapyr David Stoltenberg, Chris Boerboom (Moved)
9 1171Giant Foxtail1999Setaria faberi
Giant Foxtail
United States
(Wisconsin)
WisconsinWI ALS inhibitors (B/2) ALS inhibitors (B/2) imazethapyr, nicosulfuron David Stoltenberg, Chris Boerboom (Moved)
10 1172Green Foxtail1999Setaria viridis
Green Foxtail
United States
(Wisconsin)
WisconsinWI ALS inhibitors (B/2) ALS inhibitors (B/2) imazamox David Stoltenberg, Chris Boerboom (Moved)
11 5090Tall Waterhemp1999Amaranthus tuberculatus (=A. rudis)
Tall Waterhemp
United States
(Wisconsin)
Wisconsin  ALS inhibitors (B/2) ALS inhibitors (B/2) imazethapyr Jerry Doll (Retired), David Stoltenberg, Chris Boerboom (Moved), Vince Davis (moved)
12 5660Giant Ragweed2011Ambrosia trifida
Giant Ragweed
United States
(Wisconsin)
Wisconsin  EPSP synthase inhibitors (G/9) EPSP synthase inhibitors (G/9) glyphosate David Stoltenberg, Vince Davis (moved)
13 7822Giant Ragweed2013Ambrosia trifida
Giant Ragweed
United States
(Wisconsin)
Wisconsin  ALS inhibitors (B/2) ALS inhibitors (B/2) cloransulam-methyl, imazamox David Stoltenberg, Vince Davis (moved)
14 7823Horseweed2013Conyza canadensis
Horseweed
United States
(Wisconsin)
Wisconsin  EPSP synthase inhibitors (G/9) EPSP synthase inhibitors (G/9) glyphosate David Stoltenberg, Vince Davis (moved)
15 10957Palmer Amaranth2013Amaranthus palmeri
Palmer Amaranth
United States
(Wisconsin)
Wisconsin  EPSP synthase inhibitors (G/9) EPSP synthase inhibitors (G/9) glyphosate Vince Davis (moved)
16 10958Tall Waterhemp2013Amaranthus tuberculatus (=A. rudis)
Tall Waterhemp
United States
(Wisconsin)
Wisconsin  EPSP synthase inhibitors (G/9) EPSP synthase inhibitors (G/9) glyphosate Vince Davis (moved)
17 10981Common Ragweed2013Ambrosia artemisiifolia
Common Ragweed
United States
(Wisconsin)
Wisconsin  ALS inhibitors (B/2) ALS inhibitors (B/2) cloransulam-methyl David Stoltenberg, Vince Davis (moved), Thomas Butts (moved)
18 16099Palmer Amaranth2014Amaranthus palmeri
Palmer Amaranth
United States
(Wisconsin)
Wisconsin  ALS inhibitors (B/2), HPPD inhibitors (F2/27) Multiple Resistance: 2 Sites of Action
ALS inhibitors (B/2)
HPPD inhibitors (F2/27)
imazethapyr, tembotrione, thifensulfuron-methyl David Stoltenberg
19 16100Tall Waterhemp2016Amaranthus tuberculatus (=A. rudis)
Tall Waterhemp
United States
(Wisconsin)
Wisconsin  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 David Stoltenberg
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Cite this site as: Heap, I.  The International Survey of Herbicide Resistant Weeds.  Online.  Internet.  Sunday, November 19, 2017 .  Available  www.weedscience.org
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