First Report of Amaranthus hybridus with Multiple Resistance to 2,4-D, Dicamba, and Glyphosate

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Author
Dellaferrera, Ignacio
Cortés, Eduardo
Panigo, Elisa
Prado Amián, Rafael de
Christoffoleti, Pedro
Perreta, Mariel
Publisher
MDPIDate
2018Subject
Herbicide resistanceAmarantaceae
Smooth pigweed
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In many countries, Amaranthus hybridus is a widespread weed in agricultural systems.
The high prolificacy and invasive capacity as well as the resistance of some biotypes to herbicides
are among the complications of handling this weed. This paper reports on the first A. hybridus
biotypes with resistance to auxinic herbicides and multiple resistance to auxinic herbicides and
the EPSPs inhibitor, glyphosate. Several dose response assays were carried out to determine
and compare sensitivity of six population of A. hybridus to glyphosate, 2,4-D, and dicamba.
In addition, shikimic acid accumulation and piperonil butoxide effects on 2,4-D and dicamba
metabolism were tested in the same populations. The results showed four populations were resistant
to dicamba and three of these were also resistant to 2,4-D, while only one population was resistant
to glyphosate. The glyphosate-resistant population also showed multiple resistance to auxinic
herbicides. Pretreatment with piperonil butoxide (PBO) followed by 2,4-D or dicamba resulted in the
death of all individual weeds independent of herbicide or population