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Waterhemp has evolved resistance to 4 herbicide sites of action

A research study provides worrisome new details about the evolution of herbicide resistance in waterhemp

Date:
September 13, 2019
Source:
Cambridge University Press
Summary:
When a waterhemp biotype in eastern Nebraska survived a post-emergent application of the PPO inhibitor fomesafen, scientists decided to take a close look. They discovered the population was resistant to four distinct herbicide sites of action, including PPO inhibitors, ALS inhibitors, EPSPS inhibitors and PS II inhibitors.
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A research study featured in the journal Weed Science provides worrisome new details about the evolution of herbicide resistance in waterhemp -- an annual weed that represents a significant threat to Midwest corn and soybean crops.

When a waterhemp biotype in eastern Nebraska survived a post-emergent application of the PPO inhibitor fomesafen, a team of university scientists decided to take a close look. They discovered the population was resistant to four distinct herbicide sites of action, including PPO inhibitors, ALS inhibitors, EPSPS inhibitors and PS II inhibitors.

Among their findings:

  • All samples of the resistant waterhemp biotype tested positive for an ?G210 mutation in the PPX2L gene.
  • The population exhibited a four- to six-fold resistance to PPO-inhibiting herbicides, a three-fold resistance to EPSPS inhibitors (glyphosate) and a seven-fold resistance to atrazine (a PS II inhibitor).
  • When the ALS inhibitors chlorimuron and imazethapyr were applied at 32 times the label application rate, they achieved a less than 80 percent reduction in the aboveground biomass of the resistant waterhemp biotype.

"Our study showed there simply are no effective post-emergent herbicide choices for the control of resistant waterhemp in either glyphosate-resistant or conventional crops," said Debalin Sarangi, a postdoctoral researcher at the University of Nebraska-Lincoln. "Growers will need to diversify their approaches to weed management and complement the use of chemicals with cultural and mechanical controls."


Story Source:

Materials provided by Cambridge University Press. Note: Content may be edited for style and length.


Journal Reference:

  1. Debalin Sarangi, Trey Stephens, Abigail L. Barker, Eric L. Patterson, Todd A. Gaines, Amit J. Jhala. Protoporphyrinogen oxidase (PPO) inhibitor–resistant waterhemp (Amaranthus tuberculatus) from Nebraska is multiple herbicide resistant: confirmation, mechanism of resistance, and management. Weed Science, 2019; 67 (05): 510 DOI: 10.1017/wsc.2019.29

Cite This Page:

Cambridge University Press. "Waterhemp has evolved resistance to 4 herbicide sites of action." ScienceDaily. ScienceDaily, 13 September 2019. <www.sciencedaily.com/releases/2019/09/190913101426.htm>.
Cambridge University Press. (2019, September 13). Waterhemp has evolved resistance to 4 herbicide sites of action. ScienceDaily. Retrieved October 4, 2024 from www.sciencedaily.com/releases/2019/09/190913101426.htm
Cambridge University Press. "Waterhemp has evolved resistance to 4 herbicide sites of action." ScienceDaily. www.sciencedaily.com/releases/2019/09/190913101426.htm (accessed October 4, 2024).

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