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Suspected 2,4-D Resistant Waterhemp Population Discovered

February 13, 2024

We know the evolution of resistance in waterhemp populations happens faster than new herbicides are discovered, so the recent report of dicamba resistant waterhemp in Iowa by Bayer was not unexpected. Corteva has now reported the discovery of a suspected 2,4-D resistant waterhemp population in Iowa.

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Palmer amaranth resistance to 2,4-D and dicamba confirmed in Kansas

March 4, 2019 8:39 AM
Blog Post

Recent research at Kansas State University has confirmed farmers' claims of reduced herbicide efficacy in controlling Palmer amaranth in fields. According to the research, Palmer amaranth samples, collected from a long-term conservation tillage study, were identified as being resistant to 2,4-D and dicamba. This is the first confirmed case of resistance to dicamba and 2,4-D in Palmer amaranth, further magnifying the  challenge to manage this weed in conservation tillage systems.

Fall Marestail (Horseweed) Management

October 2, 2017

Marestail (Conyza canadensis) is one of the most difficult weeds to manage in no-till soybean.  While classified as a winter annual, the plant has significant emergence in both late summer/early fall and in the spring.  This extended emergence period greatly complicates management since the success of postemergence products is closely tied to plant size.  Attempting to control populations at the time of planting often results in control failures as fall-emerged plants are too large for acceptable control.

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Not all drift is created equal

December 29, 2016 8:22 AM
Blog Post

People involved in weed management for at least 20 years probably remember corn being damaged by glyphosate drift when Roundup Ready soybean were first introduced.  The extensive damage was due to the high susceptibility of corn to glyphosate; equipping sprayers with low-drift nozzles and the adoption of Roundup Ready corn hybrids has minimized problems associated with glyphosate drift.


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Deciphering the new 2,4-D and dicamba labels

December 22, 2016 7:56 AM
Blog Post

The recent approval of the new dicamba products approved for use on Xtend soybean has been received with mix feelings by the agricultural community; many are excited about the new options to help with the growing herbicide resistance problem, whereas others are concerned about the risks associated with off-target movement of these products.  Two dicamba products (Engenia and Xtendimax with VaporGrip Technology) are now approved by EPA, and the Xtend trait has been approved by important trade partners.  Enlist Duo has been approved by EPA, but Enlist soybean are still waiting

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