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Bromoxynil-Resistant Cotton and Selected Weed Response to Mixtures of Bromoxynil and Pyrithiobac

Published online by Cambridge University Press:  20 January 2017

Mary D. Paulsgrove ,
Whitnee L. Barker  and
John W. Wilcut
Mary D. Paulsgrove
Affiliation:
Bayer CropScience, Research Triangle Park, NC 27709
Whitnee L. Barker
Affiliation:
CropScience Department, Box 7620, North Carolina State University, Raleigh, NC 27695-7620
John W. Wilcut*
Affiliation:
CropScience Department, Box 7620, North Carolina State University, Raleigh, NC 27695-7620
*
Corresponding author's E-mail: [email protected]
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Abstract

An experiment was conducted at four locations in North Carolina in 1996 and 1997 to evaluate weed control and cotton response in conventional-tillage bromoxynil-resistant cotton. Weed management systems evaluated included a factorial arrangement of bromoxynil postemergence (POST) at 0, 0.28, 0.42, or 0.56 kg ai/ha in mixture with pyrithiobac POST at 0, 0.018, 0.032, or 0.072 kg ai/ha. Additional treatments evaluated included trifluralin preplant-incorporated (PPI) plus fluometuron preemergence (PRE). All systems received a postemergence-directed (PDS) treatment of fluometuron plus MSMA. Bromoxynil at 0.42 kg/ha POST followed by (fb) fluometuron plus MSMA PDS controlled common lambsquarters, common ragweed, eclipta, prickly sida, redroot pigweed, spurred anoda; and entireleaf, ivyleaf, pitted, and tall morningglory at least 93%, whereas smooth pigweed and volunteer peanut were controlled 73 and 86%, respectively. Pyrithiobac at 0.036 kg/ha POST fb fluometuron plus MSMA PDS controlled eclipta, common ragweed, prickly sida, redroot, and smooth pigweed, and spurred anoda at least 94%. Volunteer peanut was controlled 84% by pyrithiobac at 0.032 kg/ha, whereas pitted, ivyleaf, and entireleaf morningglory were controlled by 63, 78, and 83%, respectively. Pyrithiobac at 0.072 kg/ha fb fluometuron plus MSMA PDS controlled common lambsquarters 48%. Cotton yield with bromoxynil plus pyrithiobac POST mixtures were equivalent to trifluralin PPI plus fluometuron PRE at three locations and better at the fourth location. Bromoxynil-resistant cotton ‘47’ and ‘57’ had excellent tolerance to all POST herbicide treatments.

Keywords

BromoxynilfluometuronMSMApyrithiobactrifluralincommon lambsquarters, Chenopodium album L. # CHEALcommon ragweed, Ambrosia artemisiifolia L. # AMBELeclipta, Eclipta prostrata L. # ECLALentireleaf morningglory, Ipomoea hederaceae var. integriuscula Gray # IPOHGivyleaf morningglory, Ipomoea hederacea (L.) Jacq. IPOHEpitted morningglory, Ipomoea lacunosa L. # IPOLApeanut, Arachis hypogaea L.prickly sida, Sida spinosa L. # SIDSPredroot pigweed, Amaranthus retroflexus L. # AMAREsmooth pigweed, Amaranthus hybridus L. # AMACHspurred anoda, Anoda cristata (L.) Schlecht. # ANVCRtall morningglory, Ipomoea purpurea (L.) Roth. # PHBPUcotton, Gossypium hirsutum L., ‘BXN 47’, ‘BXN 57’Cotton yieldcrop tolerancecyanazineherbicide-resistant cropsDAT, days after treatmentfb, followed byPDS, postemergence directedPOST, postemergencePPI, preplant incorporatedPRE, preemergence
Type
Research Article
Information
Weed Technology , Volume 19 , Issue 3 , September 2005 , pp. 753 - 761
Copyright
Copyright © Weed Science Society of America 

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