International Survey of Herbicide-Resistant Weeds

Countries Weeds Herbicides Mutations Graphs References Researchers
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Herbicide Resistant Weeds in Virginia, United States.
#YearSpeciesSite of ActionActivesContacts
1 273Smooth Pigweed1976Amaranthus hybridus (syn: quitensis)
Smooth Pigweed
United States
(Virginia)
VirginiaVA PSII inhibitors - Serine 264 Binders (C1 C2/5) PSII inhibitors - Serine 264 Binders (C1 C2/5) atrazine Chester Foy, Kriton Hatzios
2 274Common Lambsquarters1979Chenopodium album
Common Lambsquarters
United States
(Virginia)
VirginiaVA PSII inhibitors - Serine 264 Binders (C1 C2/5) PSII inhibitors - Serine 264 Binders (C1 C2/5) atrazine Chester Foy, Kriton Hatzios
3 275Italian Ryegrass1993Lolium perenne ssp. multiflorum
Italian Ryegrass
United States
(Virginia)
VirginiaVA Inhibition of Acetyl CoA Carboxylase (A/1) Inhibition of Acetyl CoA Carboxylase (A/1) diclofop-methyl Chester Foy, Henry Wilson, Scott Hagood
4 373Redroot Pigweed1993Amaranthus retroflexus
Redroot Pigweed
United States
(Virginia)
VirginiaVA PSII inhibitors - Serine 264 Binders (C1 C2/5) PSII inhibitors - Serine 264 Binders (C1 C2/5) atrazine Kriton Hatzios
5 278Smooth Pigweed1994Amaranthus hybridus (syn: quitensis)
Smooth Pigweed
United States
(Virginia)
VirginiaVA Inhibition of Acetolactate Synthase (B/2) Inhibition of Acetolactate Synthase (B/2) imazaquin, imazethapyr Kriton Hatzios
6 1108Johnsongrass1995Sorghum halepense
Johnsongrass
United States
(Virginia)
VirginiaVA Inhibition of Acetyl CoA Carboxylase (A/1) Inhibition of Acetyl CoA Carboxylase (A/1) sethoxydim Scott Hagood
7 5162Annual Bluegrass2001Poa annua
Annual Bluegrass
United States
(Virginia)
Virginia  PSII inhibitors - Serine 264 Binders (C1 C2/5) PSII inhibitors - Serine 264 Binders (C1 C2/5) simazine Jeffrey Derr
8 5204Shattercane2003Sorghum bicolor
Shattercane
United States
(Virginia)
Virginia  Inhibition of Acetolactate Synthase (B/2) Inhibition of Acetolactate Synthase (B/2) imazapyr, imazethapyr, nicosulfuron Scott Hagood, Steven King
9 5559Horseweed2005Conyza canadensis
Horseweed
United States
(Virginia)
Virginia  Inhibition of Enolpyruvyl Shikimate Phosphate Synthase (G/9) Inhibition of Enolpyruvyl Shikimate Phosphate Synthase (G/9) glyphosate Henry Wilson
10 5373Common Chickweed2008Stellaria media
Common Chickweed
United States
(Virginia)
Virginia  Inhibition of Acetolactate Synthase (B/2) Inhibition of Acetolactate Synthase (B/2) thifensulfuron-methyl Scott Hagood
11 5568Palmer Amaranth2011Amaranthus palmeri
Palmer Amaranth
United States
(Virginia)
VirginiaVirginia Inhibition of Enolpyruvyl Shikimate Phosphate Synthase (G/9) Inhibition of Enolpyruvyl Shikimate Phosphate Synthase (G/9) glyphosate Henry Wilson, Scott Hagood, Amro Ahmed
12 15073Goosegrass2015Eleusine indica
Goosegrass
United States
(Virginia)
Virginia  Inhibition of Protoporphyrinogen Oxidase (E/14) Inhibition of Protoporphyrinogen Oxidase (E/14) oxadiazon Scott Mcelroy
13 21232Mouse-ear Cress2015Arabidopsis thaliana
Mouse-ear Cress
United States
(Virginia)
Virginia  Inhibition of Acetolactate Synthase (B/2) Inhibition of Acetolactate Synthase (B/2) flucarbazone-Na, mesosulfuron-methyl, pyroxsulam, thifensulfuron-methyl, tribenuron-methyl Scott Hagood
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Cite this site as: Heap, I.  The International Survey of Herbicide Resistant Weeds.  Online.  Internet.  Monday, November 29, 2021 .  Available  www.weedscience.org
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