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Herbicide Resistance Status and
Seedbank Persistence of Palmer amaranth
(Amaranthus palmeri) and Waterhemp
(A. tuberculatus) in Texas

October 2018

By Muthu Bagavathiannan, Ph.D.
Assistant Professor
Weed Science and Agronomy
Department of Soil and Crop Sciences
Texas A&M AgriLife Research
College Station, Texas

By Peter Dotray, Ph.D.
Rockwell Professor
Extension Weed Specialist
Texas Tech University
Texas A&M AgriLife Research
Texas A&M AgriLife Extension Service
Lubbock, Texas

Watch Presentation (12 min 29 sec)

for PC, Mac, and Articulate Mobile Player App (9.2 MB)
Video for Android (34.9 MB) | Video for iPhone (51.1 MB)

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Summary: Weed resistance is a growing issue in Texas, particularly in the two major pigweed species: Palmer amaranth and waterhemp. However, knowledge has been limited on the current level of resistance in these species as well as their persistence in the soil seedbank. This presentation will help consultants, growers, and other practitioners in Texas to understand more about the distribution of resistance in these weed species to some of the historically important herbicides such as glyphosate and atrazine, as well as the longevity of pigweed seeds in the soil seedbank after burial. The information provided in the presentation will help create awareness among the practitioners on the significance of herbicide-resistant weeds in Texas and the importance of being proactive in protecting available herbicide options. The seedbank longevity data informs practical management of these species. At the end of the presentation, the practitioners will develop an understanding of how to deplete the soil seedbank of Palmer amaranth and waterhemp.

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