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Tolerance of Direct-Seeded Green Onions to Herbicides Applied Before or After Crop Emergence

Published online by Cambridge University Press:  20 January 2017

Jason K. Norsworthy ,
John P. Smith  and
Charles Meister
Jason K. Norsworthy*
Affiliation:
Department of Entomology, Soils, and Plant Sciences, Clemson University, 277 Poole Agricultural Center, Clemson, SC 29634
John P. Smith
Affiliation:
Department of Entomology, Soils, and Plant Sciences, Clemson University, Edisto Research and Education Center, 64 Research Rd., Blackville, SC 29817
Charles Meister
Affiliation:
University of Florida, P.O. Box 110720, Gainesville, FL 32611-0720
*
Corresponding author's E-mail: jnorswo@clemson.edu
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Abstract

Field experiments were conducted in 2004 and 2005 to determine the tolerance of direct-seeded green onion to selected herbicides applied before or after green onion emergence. Preemergence herbicides included S-metolachlor, pendimethalin, dimethenamid, quinclorac, pronamide, ethofumesate, and DCPA, a registered standard. Herbicide applied to two- to three-leaf green onion included glyphosate, trifloxysulfuron, flumioxazin, phenmedipham, ethalfluralin, pendimethalin, S-metolachlor, and oxyfluorfen. Plots were cultivated and hand weeded to minimize negative effects of weed interference on the crop. All herbicides applied at seeding, excluding DCPA, caused excessive injury (>25%) to green onion in at least 1 of 2 years. Oxyfluorfen, ethalfluralin, or S-metolachlor applied after crop emergence caused less than 10% injury in both years to green onion. Green onion yields following treatment with oxyfluorfen, ethalfluralin, or S-metolachlor were equivalent to the nontreated control. All other herbicides applied after crop emergence resulted in height, density, or yield reductions relative to a nontreated control in at least 1 of 2 years.

Keywords

DCPAdimethenamidethalfluralinethofumesateflumioxazinglyphosateoxyfluorfenpendimethalinphenmediphampronamidequincloracS-metolachlortrifloxysulfurongreen onion, Allium cepa L. ‘White Spear 85’Crop injuryherbicide tolerance
Type
Research
Information
Weed Technology , Volume 21 , Issue 1 , March 2007 , pp. 119 - 123
Copyright
Copyright © Weed Science Society of America 

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