Confirmation and Control of HPPD-Inhibiting Herbicide-Resistant Waterhemp (Amaranthus tuberculatus) in Nebraska

Maxwel C. Oliveira, Amit J. Jhala, Todd Gaines, Suat Irmak, Keenan Amundsen, Jon E. Scott, Stevan Z. Knezevic

Research output: Contribution to journalArticlepeer-review

39 Citations (SciVal)


Field and greenhouse experiments were conducted in Nebraska to (1) confirm the 4-hydroxyphenylpyruvate dioxygenase (HPPD)-inhibiting resistant-waterhemp biotype (HPPD-RW) by quantifying the resistance levels in dose-response studies, and (2) to evaluate efficacy of PRE-only, POST-only, and PRE followed by POST herbicide programs for control of HPPD-RW in corn. Greenhouse dose-response studies confirmed that the suspected waterhemp biotype in Nebraska has evolved resistance to HPPD-inhibiting herbicides with a 2- to 18-fold resistance depending upon the type of HPPD-inhibiting herbicide being sprayed. Under field conditions, at 56 d after treatment, ≥90% control of the HPPD-RW was achieved with PRE-applied mesotrione/atrazine/S-metolachlor+acetochlor, pyroxasulfone (180 and 270 g ai ha-1), pyroxasulfone/fluthiacet-methyl/atrazine, and pyroxasulfone+saflufenacil+atrazine. Among POST-only herbicide programs, glyphosate, a premix of mesotrione/atrazine tank-mixed with diflufenzopyr/dicamba, or metribuzin, or glufosinate provided ≥92% HPPD-RW control. Herbicide combinations of different effective sites of action in mixtures provided ≥86% HPPD-RW control in PRE followed by POST herbicide programs. It is concluded that the suspected waterhemp biotype is resistant to HPPD-inhibiting herbicides and alternative herbicide programs are available for effective control in corn. The occurrence of HPPD-RW in Nebraska is significant because it limits the effectiveness of HPPD-inhibiting herbicides.

Original languageEnglish (US)
Pages (from-to)67-79
Number of pages13
JournalWeed Technology
Issue number1
StatePublished - Jan 1 2017

All Science Journal Classification (ASJC) codes

  • Agronomy and Crop Science
  • Plant Science


Dive into the research topics of 'Confirmation and Control of HPPD-Inhibiting Herbicide-Resistant Waterhemp (Amaranthus tuberculatus) in Nebraska'. Together they form a unique fingerprint.

Cite this