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Sicklepod (Senna obtusifolia) Management in an ALS-Modified Soybean (Glycine max)

Published online by Cambridge University Press:  12 June 2017

A. Stanley Culpepper ,
Alan C. York ,
Roger B. Batts  and
Katherine M. Jennings
A. Stanley Culpepper
Affiliation:
Crop Science Department, North Carolina State University, Raleigh, NC 27695-7620
Alan C. York
Affiliation:
Crop Science Department, North Carolina State University, Raleigh, NC 27695-7620
Roger B. Batts
Affiliation:
Crop Science Department, North Carolina State University, Raleigh, NC 27695-7620
Katherine M. Jennings
Affiliation:
Crop Science Department, North Carolina State University, Raleigh, NC 27695-7620
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Abstract

Herbicide systems consisting of PRE, early POST, and late POST options arranged factorially were compared for control of sicklepod in narrow-row soybean with modified acetolactate synthase (ALS) (E.C.4.1.3.18). Other weeds present included common cocklebur and mixed infestations of entireleaf, ivyleaf, pitted, and tall morningglories. PRE options were alachlor or alachlor plus metribuzin plus chlorimuron. Early POST options included chlorimuron, chlorimuron plus thifensulfuron, and no herbicide applied 3 wk after planting. Late POST options were chlorimuron and no herbicide applied 5 wk after planting. POST herbicides were more effective than PRE herbicides on all weeds. Chlorimuron and chlorimuron plus thifensulfuron applied early POST were equally effective on these weeds and usually more effective than chlorimuron applied late POST. There was no advantage of two POST applications compared with a single early POST application. Greatest net returns were obtained in systems using only early POST herbicides. There was no economic advantage from using metribuzin plus chlorimuron PRE in systems that included an early POST herbicide.

Keywords

common cocklebur, Xanthium strumarium L. # XANSTivyleaf morningglory, Ipomoea hederacea (L.) Jacq. # IPOHEpitted morningglory, Ipomoea lacunosa L. # IPOLAsicklepod, Senna obtusifolia (L.) Irwin and Barneby # CASOBtall morningglory, Ipomoea purpurea (L.) Roth # PHBPUsoybean, Glycine max (L.) Merr. ‘Asgrow 5545 STS.’Foreign matternet returnssulfonylurea herbicideschlorimuronmetribuzinthifensulfuronIpomoea hederaceaIpomoea hederacea var. integriusculaIpomoea lacunosaIpomoea purpureaXanthium strumariumCASOBIPOHEIPOHGIPOLAPHBPUXANSTALS, acetolactate synthase
Type
Research
Information
Weed Technology , Volume 11 , Issue 1 , March 1997 , pp. 164 - 170
Copyright
Copyright © 1997 by the Weed Science Society of America 

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