International Survey of Herbicide-Resistant Weeds

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Status of Herbicide Resistance in Texas - Paul Baumann : January, 2014

Our most pressing issues at this time are glyphosate resistant common waterhemp and Palmer amaranth. These have just started to be an issue for us in corn, cotton, and sorghum. However, we have not as yet had the same infestation levels as some states in the Southeast. We have been warning of this issue for years and suggesting management programs.

Herbicide Resistant Weeds in Texas, United States.
#YearSpeciesSite of ActionActivesContacts
1 397Perennial Ryegrass1989Lolium perenne
Perennial Ryegrass
United States
(Texas)
Texas  Inhibition of Acetolactate Synthase (B/2) Inhibition of Acetolactate Synthase (B/2) sulfometuron-methyl Leonard Saari, Paul Baumann, Travis Miller
2 271Barnyardgrass1991Echinochloa crus-galli var. crus-galli
Barnyardgrass
United States
(Texas)
TexasTX PSII inhibitors - Serine 264 Binders (C1 C2/5) PSII inhibitors - Serine 264 Binders (C1 C2/5) propanil Arlen Klosterboer
3 270Palmer Amaranth1993Amaranthus palmeri
Palmer Amaranth
United States
(Texas)
Texas  PSII inhibitors - Serine 264 Binders (C1 C2/5) PSII inhibitors - Serine 264 Binders (C1 C2/5) atrazine Paul Baumann, Peter Dotray
4 5063Kochia1998Kochia scoparia
Kochia
United States
(Texas)
Texas  Inhibition of Acetolactate Synthase (B/2) Inhibition of Acetolactate Synthase (B/2) metsulfuron-methyl Paul Baumann, Peter Dotray
5 5091Johnsongrass2000Sorghum halepense
Johnsongrass
United States
(Texas)
Texas  Inhibition of Acetolactate Synthase (B/2) Inhibition of Acetolactate Synthase (B/2) imazethapyr, nicosulfuron Jerry Green
6 7776Tall Waterhemp2006Amaranthus tuberculatus (=A. rudis)
Tall Waterhemp
United States
(Texas)
Texas  Inhibition of Enolpyruvyl Shikimate Phosphate Synthase (G/9) Inhibition of Enolpyruvyl Shikimate Phosphate Synthase (G/9) glyphosate Paul Baumann, Peter Dotray
7 7777Palmer Amaranth2011Amaranthus palmeri
Palmer Amaranth
United States
(Texas)
Texas  Inhibition of Enolpyruvyl Shikimate Phosphate Synthase (G/9) Inhibition of Enolpyruvyl Shikimate Phosphate Synthase (G/9) glyphosate Paul Baumann, Peter Dotray, Wayne Keeling
8 15062Common Sunflower2015Helianthus annuus
Common Sunflower
United States
(Texas)
Texas  Inhibition of Enolpyruvyl Shikimate Phosphate Synthase (G/9) Inhibition of Enolpyruvyl Shikimate Phosphate Synthase (G/9) glyphosate Muthukumar Bagavathiannan, Josh McGinty
Contributing Weed Scientists
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Cite this site as: Heap, I.  The International Survey of Herbicide Resistant Weeds.  Online.  Internet.  Friday, October 4, 2024 .  Available  www.weedscience.org
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