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

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,...

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Bibliographic Details
Published in:Weed technology 2007-01, Vol.21 (1), p.119-123
Main Authors: Norsworthy, Jason K, Smith, John P, Meister, Charles
Format: Article
Language:English
Subjects:
Allium cepa
Crop density
Crop harvesting
Crop injury
crop quality
crop yield
Crops
direct seeding
field experimentation
height
herbicide resistance
herbicide tolerance
Herbicides
Onions
plant damage
plant density
Planting
Plants
postemergent weed control
preemergent weed control
Seeding
Vegetable crops
Weed control
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Summary: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. Nomenclature: DCPA, dimethenamid, ethalfluralin, ethofumesate, flumioxazin, glyphosate, oxyfluorfen, pendimethalin, phenmedipham, pronamide, quinclorac, S-metolachlor, trifloxysulfuron, green onion, Allium cepa L. ‘White Spear 85’
ISSN:0890-037X
1550-2740
DOI:10.1614/wt-06-042.1