Skip to main content Accessibility help

Postemergence Weed Control in Onion with Bentazon, Flumioxazin, and Oxyfluorfen

  • Chad M. Herrmann (a1), Margaret A. Goll (a1), Colin J. Phillippo (a1) and Bernard H. Zandstra (a1)


Field experiments were conducted in 2008 and 2010 to determine crop tolerance and weed control efficacy of the POST herbicides bentazon, flumioxazin, and oxyfluorfen applied to direct-seeded dry bulb onions on organic soil. Postemergence application of oxyfluorfen at 0.071 kg ai ha−1 resulted in less than 20% onion injury when applied at the 2 and 4 onion leaf stages and provided good control of ladysthumb and common lambsquarters. Oxyfluorfen EC caused slightly higher visual injury than oxyfluorfen SC, but there was no difference in onion yield among the treatments. Application of flumioxazin at 0.036 of 0.072 kg ai ha−1 alone or in combination with pendimethalin ACS resulted in minimal onion injury and no yield reduction. Combining flumioxazin in a tank mix with pendimethalin EC, dimethenamid-P EC, or S-metolachlor EC resulted in significant onion injury and yield reduction. Flumioxazin plus S-metolachlor, dimethenamid-P, or pendimethalin improved ladysthumb control in one of two years. Bentazon applied at 0.56 kg ai ha−1 produced moderate onion injury and did not control yellow nutsedge adequately. Bentazon applied at 1.12 kg ai ha−1 provided good control of yellow nutsedge but caused serious onion injury and yield loss.

En 2008 y 2010 se realizaron experimentos de campo para determinar la tolerancia del cultivo y el control eficaz de malezas de los herbicidas POST bentazon, flumioxazin, y oxyfluorfen aplicados a bulbos secos de cebolla en siembra directa en un suelo orgánico. La aplicación en postemergencia de oxyfluorfen a 0.071 kg ai ha−1 resultó en menos de 20% de daño en la cebolla cuando se aplicó en los estadios de la cebolla de 2 y 4 hojas, además brindó buen control de Polygonum persicaria y Chenopodium album. Oxyfluorfen EC causó un daño visual ligeramente mayor que oxyfluorfen SC, pero no hubo diferencias en el rendimiento de la cebolla entre ambos tratamientos. La aplicación de flumioxazin a 0.036 ó 0.072 kg ai ha−1 sólo o en combinación con pendimethalin ACS resultó en un daño mínimo a la cebolla sin ninguna reducción en el rendimiento. La combinación en mezclas en tanque de flumioxazin con pendimethalin EC, dimethenamid-P EC, o S-metolachlor EC resultó en un daño significativo a la cebolla y en reducción del rendimiento. Flumioxazin más S-metolachlor, dimethenamid-P, o pendimethalin mejoraron el control de P. persicaria en uno de los dos años. Bentazon aplicado a 0.56 kg ai ha−1 produjo un daño moderado a la cebolla y no controló Cyperus esculentus adecuadamente. Bentazon aplicado a 1.12 kg ai ha−1 brindó buen control de C. esculentus, pero causó serios daños y pérdida de rendimiento en la cebolla.


Corresponding author

*Corresponding author’s E-mail:


Hide All

Associate Editor for this paper: Robert Nurse, Agriculture and Agri-Food Canada



Hide All
Anonymous (2014) Goaltender® herbicide label. Dow AgroSciences. Accessed February 10, 2017
Bond, W, Burston, S (1996) Timing the removal of weeds from drilled salad onions to prevent crop losses. Crop Prot 15:205211
Boydston, RA, Seymour, MD (2002) Volunteer potato (Solanum tuberosum) control with herbicides and cultivation in onion (Allium cepa). Weed Technol 16:620626
Cudney, DW, Orloff, SB (1988) Russian thistle, Salsola iberica, control in onion, Allium cepa . Weed Technol 2:375378
Dunan, CM, Westra, P, Moore, F, Chapman, P (1995) The concept and application of early economic period threshold: the case of DCPA in onions (Allium cepa). Weed Sci 43:634639
Dunan, CM, Westra, P, Schweizer, EE, Lybecker, DW, Moore, FD (1996) Modelling the effect of duration of weed competition, weed density and weed competitiveness on seeded, irrigated onion. Weed Res 36:259269
Fennimore, SA, Doohan, DJ (2008) The challenges of specialty crop weed control, future directions. Weed Technol 22:364372
Ghosheh, HZ (2004) Single herbicide treatments for control of broadleaved weeds in onion (Allium cepa). Crop Prot 23:539542
Hatzinikolaou, AS, Eleftherohorinos, IG, Vasilakoglou, IB (2004) Influence of formulation on the activity and persistence of pendimethalin. Weed Technol 18:397403
Keeling, JW, Bender, DA, Abernathy, JR (1990) Yellow nutsedge (Cyperus esculentus) management in transplanted onions (Allium cepa). Weed Technol 4:6870
Loken, JR, Hatterman-Valenti, HM (2010) Multiple applications of reduced-rate herbicides for weed control in onion. Weed Technol 24:153159
Menges, RM, Tamez, S (1981) Response of onion (Allium cepa L.) to annual weeds and postemergence herbicides. Weed Sci 29:7479
National Onion Association. (2011) All About Onions. How and Where Onions are Grown. Accessed December 28, 2015
Norsworthy, JK, Smith, JP, Meister, C (2007) Tolerance of direct-seeded green onions to herbicides applied before or after crop emergence. Weed Technol 21:119123
Peachey, E, Felix, J, Boydston, RA (2008) Dry bulb onion tolerance to sequential applications of bentazon applied to control yellow nutsedge (Cyperus esculentus L.) in the Pacific Northwest. Proc Weed Sci Soc Am 48:33
Qasem, JR (2005) Chemical control of weeds in onion (Allium cepa L.). J Hortic Sci Biotechnol 80:721726
Richardson, JM, Mueller, JP, Yoshida, HH, Gast, RE, Dorich, RA (2006) Performance of a new oxyfluorfen formulation on early-stage onions in five western states. Proc West Soc Weed Sci 59:70
Schumacher, CE, Hatterman-Valenti, HM (2007) Effect of dose and spray volume on early-season broadleaved weed control in Allium using herbicides. Crop Prot 26:11781185
Smith, R (2007) Dry Bulb Onion Weed Control Studies. Monterey, CA: University of California Cooperative Extension
Wicks, GA, Johnston, DN, Nuland, DS, Kinbacher, EJ (1973) Competition between annual weeds and sweet Spanish onions. Weed Sci 21:436439
Williams, MM 2nd, Ransom, CV, Thompson, WM (2007) Volunteer potato density influences critical time of weed removal in bulb onion. Weed Technol 21:136140
Zandstra, BH, Grafius, EJ, Lacy, ML, Warncke, DD (1996) Onions: Commercial Vegetable Recommendations. East Lansing, MI: Michigan State University Extension Bulletin E-1307
Zandstra, BH (2014) 2015 Weed Control Guide for Vegetable Crops. East Lansing, MI: Michigan State University Extension Bulletin E-433



Full text views

Total number of HTML views: 0
Total number of PDF views: 0 *
Loading metrics...

Abstract views

Total abstract views: 0 *
Loading metrics...

* Views captured on Cambridge Core between <date>. This data will be updated every 24 hours.

Usage data cannot currently be displayed