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  ALS inhibitors (B/2) ALS inhibitors (B/2) sulfometuron-methyl Leonard Saari, Paul Baumann, Travis Miller
2 271Barnyardgrass1991Echinochloa crus-galli var. crus-galli
Barnyardgrass
United States
(Texas)
TexasTX PSII inhibitor (Ureas and amides) (C2/7) PSII inhibitor (Ureas and amides) (C2/7) propanil Arlen Klosterboer
3 270Palmer Amaranth1993Amaranthus palmeri
Palmer Amaranth
United States
(Texas)
Texas  Photosystem II inhibitors (C1/5) Photosystem II inhibitors (C1/5) atrazine Paul Baumann, Peter Dotray
4 5063Kochia1998Kochia scoparia
Kochia
United States
(Texas)
Texas  ALS inhibitors (B/2) ALS inhibitors (B/2) metsulfuron-methyl Paul Baumann, Peter Dotray
5 5091Johnsongrass2000Sorghum halepense
Johnsongrass
United States
(Texas)
Texas  ALS inhibitors (B/2) ALS inhibitors (B/2) imazethapyr, nicosulfuron Jerry Green
6 7776Tall Waterhemp2006Amaranthus tuberculatus (=A. rudis)
Tall Waterhemp
United States
(Texas)
Texas  EPSP synthase inhibitors (G/9) EPSP synthase inhibitors (G/9) glyphosate Paul Baumann, Peter Dotray
7 7777Palmer Amaranth2011Amaranthus palmeri
Palmer Amaranth
United States
(Texas)
Texas  EPSP synthase inhibitors (G/9) EPSP synthase inhibitors (G/9) glyphosate Paul Baumann, Peter Dotray, Wayne Keeling
8 15062Common Sunflower2015Helianthus annuus
Common Sunflower
United States
(Texas)
Texas  EPSP synthase inhibitors (G/9) EPSP synthase inhibitors (G/9) glyphosate Muthukumar Bagavathiannan, Josh McGinty
Contributing Weed Scientists
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