WESTMINSTER, Colorado – September 13, 2019 – 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.
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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.”
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To learn more, read the article ”
Protoporphyrinogen Oxidase (PPO) Inhibitor-Resistant Waterhemp (Amaranthus tuberculatus) from Nebraska is Multiple Herbicide-Resistant: Confirmation, Mechanism of Resistance, and Management.
” It is available online at
www.cambridge.org/core/journals/weed-science
.
About
Weed Science
Weed Science
is a journal of the Weed Science Society of America, a nonprofit scientific society focused on weeds and their impact on the environment. The publication presents peer-reviewed original research related to all aspects of weed science, including the biology, ecology, physiology, management and control of weeds. To learn more, visit
http://www.
net
.
This part of information is sourced from https://www.eurekalert.org/pub_releases/2019-09/cup-rfw091319.php
Natalie Warrender
[email protected]
http://www.cambridge.org/