International Survey of Herbicide-Resistant Weeds

Countries Weeds Herbicides Mutations Graphs References Researchers
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Status of Herbicide Resistance in Florida - Jason Ferrell : January, 2014

Like everywhere else, herbicide resistant Palmer amaranth is a problem here in FL. We are not 100% glyphosate resistant in this state. We are not 100% ALS resistant. But, there are pockets of both. Likewise, we have found a population or two that are resistant to both ALS and glyphosate. This is currently on a limited number of acres. However, growers have adopted good management programs and the impact of this weed is lessening.

Herbicide Resistant Weeds in Florida, United States.
#YearSpeciesSite of ActionActivesContacts
1 226American Black Nightshade1985Solanum americanum
American Black Nightshade
United States
(Florida)
FloridaFL PSI Electron Diverter (D/22) PSI Electron Diverter (D/22) paraquat William Stall
2 5053Goosegrass1996Eleusine indica
Goosegrass
United States
(Florida)
Florida  PSI Electron Diverter (D/22) PSI Electron Diverter (D/22) paraquat Greg Macdonald, William Stall
3 5247Dotted Duckweed2001Landoltia punctata
Dotted Duckweed
United States
(Florida)
Florida  PSI Electron Diverter (D/22) PSI Electron Diverter (D/22) diquat, paraquat Tyler Koschnick
4 5166Hydrilla2002Hydrilla verticillata
Hydrilla
United States
(Florida)
Florida  Carotenoid biosynthesis inhibitors (F1/12) Carotenoid biosynthesis inhibitors (F1/12) fluridone Franck Dayan
5 5369Palmer Amaranth2008Amaranthus palmeri
Palmer Amaranth
United States
(Florida)
Florida  ALS inhibitors (B/2) ALS inhibitors (B/2) imazapic, pyrithiobac-sodium Greg Macdonald, Brandon Fast, Jason Ferrell
6 7869Palmer Amaranth2013Amaranthus palmeri
Palmer Amaranth
United States
(Florida)
Florida  EPSP synthase inhibitors (G/9) EPSP synthase inhibitors (G/9) glyphosate Jason Ferrell, Sarah Berger
7 7870Palmer Amaranth2013Amaranthus palmeri
Palmer Amaranth
United States
(Florida)
Florida  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, imazapic Jason Ferrell, Sarah Berger
8 11003Ragweed Parthenium2014Parthenium hysterophorus
Ragweed Parthenium
United States
(Florida)
Florida  EPSP synthase inhibitors (G/9) EPSP synthase inhibitors (G/9) glyphosate Greg Macdonald, Jason Ferrell, Dennis "Calvin" Odero, Jose Fernandez
Contributing Weed Scientists
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Cite this site as: Heap, I.  The International Survey of Herbicide Resistant Weeds.  Online.  Internet.  Sunday, December 8, 2019 .  Available  www.weedscience.org
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