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 Photosystem II inhibitors (C1/5) Photosystem II inhibitors (C1/5) atrazine Chester Foy, Kriton Hatzios
2 274Common Lambsquarters1979Chenopodium album
Common Lambsquarters
United States
(Virginia)
VirginiaVA Photosystem II inhibitors (C1/5) Photosystem II inhibitors (C1/5) atrazine Chester Foy, Kriton Hatzios
3 275Italian Ryegrass1993Lolium perenne ssp. multiflorum
Italian Ryegrass
United States
(Virginia)
VirginiaVA ACCase inhibitors (A/1) ACCase inhibitors (A/1) diclofop-methyl Chester Foy, Henry Wilson, Scott Hagood
4 373Redroot Pigweed1993Amaranthus retroflexus
Redroot Pigweed
United States
(Virginia)
VirginiaVA Photosystem II inhibitors (C1/5) Photosystem II inhibitors (C1/5) atrazine Kriton Hatzios
5 278Smooth Pigweed1994Amaranthus hybridus (syn: quitensis)
Smooth Pigweed
United States
(Virginia)
VirginiaVA ALS inhibitors (B/2) ALS inhibitors (B/2) imazaquin, imazethapyr Kriton Hatzios
6 1108Johnsongrass1995Sorghum halepense
Johnsongrass
United States
(Virginia)
VirginiaVA ACCase inhibitors (A/1) ACCase inhibitors (A/1) sethoxydim Scott Hagood
7 5162Annual Bluegrass2001Poa annua
Annual Bluegrass
United States
(Virginia)
Virginia  Photosystem II inhibitors (C1/5) Photosystem II inhibitors (C1/5) simazine Jeffrey Derr
8 5204Shattercane2003Sorghum bicolor
Shattercane
United States
(Virginia)
Virginia  ALS inhibitors (B/2) ALS inhibitors (B/2) imazapyr, imazethapyr, nicosulfuron Scott Hagood, Steven King
9 5559Horseweed2005Conyza canadensis
Horseweed
United States
(Virginia)
Virginia  EPSP synthase inhibitors (G/9) EPSP synthase inhibitors (G/9) glyphosate Henry Wilson
10 5373Common Chickweed2008Stellaria media
Common Chickweed
United States
(Virginia)
Virginia  ALS inhibitors (B/2) ALS inhibitors (B/2) thifensulfuron-methyl Scott Hagood
11 5568Palmer Amaranth2011Amaranthus palmeri
Palmer Amaranth
United States
(Virginia)
VirginiaVirginia EPSP synthase inhibitors (G/9) EPSP synthase inhibitors (G/9) glyphosate Henry Wilson, Scott Hagood, Amro Ahmed
12 15073Goosegrass2015Eleusine indica
Goosegrass
United States
(Virginia)
Virginia  PPO inhibitors (E/14) PPO inhibitors (E/14) oxadiazon Scott Mcelroy
Contributing Weed Scientists
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Cite this site as: Heap, I.  The International Survey of Herbicide Resistant Weeds.  Online.  Internet.  Wednesday, December 11, 2019 .  Available  www.weedscience.org
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