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

Facultad de Ciencias Agrarias, Universidad Nacional del Litoral, Esperanza 3080, Argentina
Consejo Nacional de Investigaciones Científicas Y Técnicas, CABA, C1425FQB, Godoy Cruz 2290, Argentina
Agencia De Extensión Rural San Francisco, Instituto Nacional de Tecnología Agropecuaria, San Francisco 2400, Argentina
Departamento de Química Agrícola y Edafología, Universidad de Córdoba, Cordoba 14014, Spain
Escuela Superior de Agricultura Luiz de Queiroz, Universidad de Sao Paulo, Piracicaba 13418-900, Brazil
Author to whom correspondence should be addressed.
Agronomy 2018, 8(8), 140;
Received: 10 July 2018 / Revised: 30 July 2018 / Accepted: 3 August 2018 / Published: 6 August 2018
(This article belongs to the Special Issue Weed Management & New Approaches)
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. View Full-Text
Keywords: herbicide resistance; amarantaceae; smooth pigweed herbicide resistance; amarantaceae; smooth pigweed
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Dellaferrera, I.; Cortés, E.; Panigo, E.; De Prado, R.; Christoffoleti, P.; Perreta, M. First Report of Amaranthus hybridus with Multiple Resistance to 2,4-D, Dicamba, and Glyphosate. Agronomy 2018, 8, 140.

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