International Survey of Herbicide-Resistant Weeds

Countries Weeds Herbicides Mutations Graphs References Researchers
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Herbicide Resistant Weeds in Delaware, United States.
#YearSpeciesSite of ActionActivesContacts
1 492Smooth Pigweed1977Amaranthus hybridus (syn: quitensis)
Smooth Pigweed
United States
(Delaware)
DelawareDE PSII inhibitors - Serine 264 Binders (C1 C2/5) PSII inhibitors - Serine 264 Binders (C1 C2/5) atrazine Mark VanGessel
2 491Common Lambsquarters1988Chenopodium album
Common Lambsquarters
United States
(Delaware)
DelawareDE PSII inhibitors - Serine 264 Binders (C1 C2/5) PSII inhibitors - Serine 264 Binders (C1 C2/5) atrazine Mark VanGessel
3 5086Horseweed2000Conyza canadensis
Horseweed
United States
(Delaware)
Delaware  Inhibition of Enolpyruvyl Shikimate Phosphate Synthase (G/9) Inhibition of Enolpyruvyl Shikimate Phosphate Synthase (G/9) glyphosate Mark VanGessel
4 5160Smooth Pigweed2000Amaranthus hybridus (syn: quitensis)
Smooth Pigweed
United States
(Delaware)
Delaware  Inhibition of Acetolactate Synthase (B/2) Inhibition of Acetolactate Synthase (B/2) imazethapyr Mark VanGessel, Henry Wilson
5 5257Horseweed2003Conyza canadensis
Horseweed
United States
(Delaware)
DelawareDE PS I Electron Diversion (D/22) PS I Electron Diversion (D/22) paraquat Mark VanGessel
6 5265Common Ragweed2005Ambrosia artemisiifolia
Common Ragweed
United States
(Delaware)
Delaware  Inhibition of Acetolactate Synthase (B/2), Inhibition of Protoporphyrinogen Oxidase (E/14) Multiple Resistance: 2 Sites of Action
Inhibition of Acetolactate Synthase (B/2)
Inhibition of Protoporphyrinogen Oxidase (E/14)
acifluorfen, carfentrazone-ethyl, chlorimuron-ethyl, cloransulam-methyl, flumiclorac-pentyl, flumioxazin, fomesafen, halosulfuron-methyl, imazamox, imazapyr, imazaquin, imazethapyr, iodosulfuron-methyl-Na, lactofen, metsulfuron-methyl, oxyfluorfen, primisulfuron-methyl, pyraflufen-ethyl, pyrithiobac-sodium, sulfentrazone, trifloxysulfuron-Na Mark VanGessel
7 5710Horseweed2010Conyza canadensis
Horseweed
United States
(Delaware)
Delaware  Inhibition of Acetolactate Synthase (B/2), Inhibition of Enolpyruvyl Shikimate Phosphate Synthase (G/9) Multiple Resistance: 2 Sites of Action
Inhibition of Acetolactate Synthase (B/2)
Inhibition of Enolpyruvyl Shikimate Phosphate Synthase (G/9)
glyphosate, thifensulfuron-methyl, tribenuron-methyl Mark VanGessel
8 5707Palmer Amaranth2012Amaranthus palmeri
Palmer Amaranth
United States
(Delaware)
Delaware  Inhibition of Enolpyruvyl Shikimate Phosphate Synthase (G/9) Inhibition of Enolpyruvyl Shikimate Phosphate Synthase (G/9) glyphosate Mark VanGessel
9 5708Common Chickweed2012Stellaria media
Common Chickweed
United States
(Delaware)
Delaware  Inhibition of Acetolactate Synthase (B/2) Inhibition of Acetolactate Synthase (B/2) thifensulfuron-methyl, tribenuron-methyl Mark VanGessel
10 5709Italian Ryegrass2012Lolium perenne ssp. multiflorum
Italian Ryegrass
United States
(Delaware)
Delaware  Inhibition of Acetolactate Synthase (B/2) Inhibition of Acetolactate Synthase (B/2) mesosulfuron-methyl Mark VanGessel
11 8914Palmer Amaranth2014Amaranthus palmeri
Palmer Amaranth
United States
(Delaware)
Delaware  Inhibition of Acetolactate Synthase (B/2), Inhibition of Enolpyruvyl Shikimate Phosphate Synthase (G/9) Multiple Resistance: 2 Sites of Action
Inhibition of Acetolactate Synthase (B/2)
Inhibition of Enolpyruvyl Shikimate Phosphate Synthase (G/9)
chlorimuron-ethyl, glyphosate Mark VanGessel
Contributing Weed Scientists
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Cite this site as: Heap, I.  The International Survey of Herbicide Resistant Weeds.  Online.  Internet.  Monday, August 2, 2021 .  Available  www.weedscience.org
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