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Weed Control and Selectivity of Pethoxamid Alone and in Mixture as a Delayed Preemergence Application to Rice

Published online by Cambridge University Press:  09 November 2018

John Godwin ,
Jason K. Norsworthy  and
Robert C. Scott
John Godwin*
Affiliation:
Graduate Research Assistant, Department of Crop, Soil, and Environmental Sciences, University of Arkansas, Fayetteville, AR, USA
Jason K. Norsworthy
Affiliation:
Professor and Elms Farming Chair of Weed Science, Department of Crop, Soil, and Environmental Sciences, University of Arkansas, Fayetteville, AR, USA,
Robert C. Scott
Affiliation:
Professor, Department of Crop, Soil, and Environmental Sciences, University of Arkansas, Fayetteville, AR, USA
*
*Author for correspondence: John Goodwin, Department of Crop, Soil, and Environmental Sciences, University of Arkansas, 1366 W Altheimer Drive, Fayetteville, AR 72704. (Email: jagodwin@email.uark.edu)
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Abstract

The evolution of herbicide resistance is making it extremely difficult for US rice producers to use chemical control on weed species such as barnyardgrass and red rice. To combat herbicide resistance, it is imperative that alternative herbicide sites of action (SOAs) be incorporated into rice whenever possible. There are currently no very-long-chain fatty acid–inhibiting herbicides (WSSA Group 15) labeled for use in US rice; however, pethoxamid is one such herbicide currently under development. If appropriate rice tolerance and weed control can be established, pethoxamid would represent a unique herbicide SOA for use in US rice. We conducted field trials near Stuttgart, AR, in 2015 and near Colt and Lonoke, AR, in 2016 to assess selectivity of pethoxamid and weed control alone and in combination with other herbicides as a delayed preemergence (DPRE) application in drill-seeded rice. Pethoxamid was applied at 0, 420, or 560 g ai ha–1 alone and in combination with clomazone, imazethapyr, pendimethalin, and quinclorac. Minimal rice injury occurred with any treatment assessed. A reduction in rice shoot density and plant height compared to the nontreated control followed the use of pethoxamid; however, no decrease in yield resulted. The highest levels of barnyardgrass control followed the use of imazethapyr at 91% and quinclorac at 89% regardless of the presence of pethoxamid near Lonoke; however, pethoxamid applied at both rates in combination with clomazone and quinclorac increased barnyardgrass control compared to clomazone and quinclorac applied alone. Near Colt, barnyardgrass control of 92% and 96% resulted from pethoxamid alone, averaged over the high and low rates. Based on these data, rice can tolerate pethoxamid when applied DPRE, and adequate levels of barnyardgrass control can be achieved at the rates evaluated within a program; hence, pethoxamid appears to be a viable option for use in rice to allow for increased rotation of herbicide SOAs to combat herbicide-resistant and difficult-to-control weeds.

Keywords

Prashant Jha, Montana State UniversityPethoxamidbarnyardgrass, Echinochloa crus-galli (L.) Beauv.red rice, Oryza spp..rice, Oryza sativa L.Weed controlherbicide-resistant weedsherbicide site of actiondelayed preemergence
Type
Research Article
Information
Weed Technology , Volume 32 , Issue 5 , October 2018 , pp. 537 - 543
Copyright
© Weed Science Society of America, 2018 

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References

Anonymous (2015) Penn State University Extension. Herbicides. http://extension.psu.edu/pests/weeds/control/introduction-to-weeds-and-herbicides/herbicides. Accessed: November 1, 2016Google Scholar
Anonymous (2017) Environmental Protection Agency. Pesticide and Product Label System. https://iaspub.epa.gov/apex/pesticides/f?p=PPLS:1. Accessed: November 6, 2017Google Scholar
Beckie, HJ, Reboud, X (2009) Selecting for weed resistance: herbicide rotation and mixture. Weed Technol 23:363–370 Google Scholar
Burgos, NR, Norsworthy, JK, Scott, RC, Smith, KL (2008) Red rice (Oryza sativa) status after 5 years of imidazolinone-resistance rice technology in Arkansas. Weed Technol 22:200–208 Google Scholar
Chauhan, BS (2012) Weed ecology and weed management strategies for dry-seeded rice in Asia. Weed Technol 26:1–13 Google Scholar
Croughan, TP, Utomo, HS, Sanders, DE, Braverman, MP (1996) Herbicide-resistant rice offers potential solution to red rice problem. LA Agric 39:10–12 Google Scholar
Doherty, RC, Barber, LT, Norsworthy, JK, Hill, ZT (2016) Residual weed control and crop response to pethoxamid systems in rice. AAES Research Series 634:159–162 Google Scholar
Gunsolus, JL, Curran, WS (1999) University of Minnesota Extension. Herbicide mode of action and injury symptoms. http://appliedweeds.cfans.umn.edu/sites/appliedweeds.cfans.umn.edu/files/herbicide_mode_of_action_and_injury_symptoms.pdf. Accessed: November 6, 2017Google Scholar
Hardke, JT (2015) Trends in Arkansas rice production. AAES Research Series 626:11–22 Google Scholar
Heap, I (2014) Herbicide Resistant Weeds in Major Crops. Integrated Pest Management. New York: Springer. p 281–301 Google Scholar
Heap, I (2017) The international survey of herbicide resistant weeds. www.weedscience.org. Accessed: May 3, 2017Google Scholar
Jursik, M, Soukup, J, Holec, J, Andr, J, Hamouzova, K (2015) Efficacy and selectivity of pre-emergent sunflower herbicides under different soil moisture conditions. Plant Prot Sci 51:214–222 Google Scholar
Miller, MR, Norsworthy, JK, Scott, RC, Barber, TL (2015) Identification, biology, and control of barnyardgrass in Arkansas rice. University of Arkansas, Division of Agriculture, Research and Extension, FSA2175. https://www.uaex.edu/publications/pdf/FSA-2175.pdf.Google Scholar
Mutnal, SM, Kumar, P, Joshi, VR, Honnannavar, SY (1998) Effect of butachlor for weed control in sprouted direct seeded paddy field under rainfed conditions. Agric Sci 11:487–489 Google Scholar
Norsworthy, JK, Burgos, NR, Scott, RC, Smith, KL (2007) Weed management needs in Arkansas rice. Weed Technol 21:832–839 Google Scholar
Norsworthy, JK, Ward, SM, Shaw, DR, Llewellyn, RS, Nichols, RL, Webster, TM, Bradley, KW, Frisvold, G, Powles, SB, Burgos, NR, Witt, WW, Barrett, M (2012) Reducing the risks of herbicide resistance: best management practices and recommendations. Weed Sci 60 (SP I):31–62 Google Scholar
Norman, R, Slaton, N, Roberts, T (2013) Soil Fertility. Pages 69–101 in Hardke JT, ed. Arkansas Rice Production Handbook– MP192. University of Arkansas, Division of Agriculture, Research and Extension, Cooperative Extension Service. https://www.uaex.edu/publications/MP-192.aspx. p 53–62Google Scholar
O’Connell, PJ, Harms, CT, Allen, JRF (1998) Metolachlor, S-metolachlor, and their role within sustainable weed management. Crop Prot 17:207–212 Google Scholar
Scott, RC, Norsworthy, JK, Barber, T, Hardke, JT (2013) Rice weed control. Pages 53–62 in Hardke JT, ed. Arkansas Rice Production Handbook–MP192. University of Arkansas, Division of Agriculture, Research and Extension, Cooperative Extension Service. https://www.uaex.edu/publications/MP-192.aspx Google Scholar
Shivrain, VK, Burgos, NR, Anders, MM, Rajguru, SN, Moore, J, Sales, MA (2007) Gene flow between Clearfield™ rice and red rice. Crop Prot 26:349–356 Google Scholar
Zimdahl, RL (2007) Inhibition of biosynthesis of very long chain fatty acids. Pages 412–414 in Fundamentals of Weed Science. 3rd edn. Burlington, MA: Elsevier Google Scholar