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Influence of Glyphosate and Glufosinate on Weed Control and Sugarbeet (Beta vulgaris) Yield in Herbicide-Tolerant Sugarbeet

Published online by Cambridge University Press:  20 January 2017

Robert G. Wilson ,
C. Dean Yonts  and
John A. Smith
Robert G. Wilson*
Affiliation:
Department of Agronomy and Horticulture, University of Nebraska, Scottsbluff, NE 69361
C. Dean Yonts
Affiliation:
Department of Biological Systems Engineering, University of Nebraska, Scottsbluff, NE 69361
John A. Smith
Affiliation:
Department of Biological Systems Engineering, University of Nebraska, Scottsbluff, NE 69361
*
Corresponding author's E-mail: rwilson1@unl.edu.
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Abstract

Field trials were conducted in 1999 and 2000 to determine the influence of weed size and the number of glyphosate or glufosinate applications on weed control and sugarbeet yield. Glyphosate at 840 g/ha or glufosinate at 390 g/ha was applied one, two, or three times, beginning when the average weed height was 3, 10, 15, or 25 cm. Two sequential applications of glyphosate applied to 10-cm weeds or three sequential applications of glufosinate applied to 3-cm weeds provided weed control comparable to three sequential applications of desmedipham plus phenmedipham plus triflusulfuron plus clopyralid. Weed control and sugarbeet root yield were optimal for two postemergence applications of glyphosate and for three applications of glufosinate. Glyphosate provided greater control of redroot pigweed and common lambsquarters than glufosinate. Sugarbeet sucrose yield with both glyphosate and glufosinate weed control programs was nearly 10,000 kg/ha. Compared with two sequential applications of glyphosate, sucrose yield of glyphosate-resistant sugarbeet was reduced 15% by three sequential applications of desmedipham plus phenmedipham plus triflusulfuron plus clopyralid. Sucrose yields were similar between three sequential applications of glufosinate and three applications of desmedipham plus phenmedipham plus triflusulfuron plus clopyralid.

Keywords

Clopyraliddesmediphamglufosinateglyphosatephenmediphamtriflusulfuroncommon lambsquarters, Chenopodium album L. #3 CHEALredroot pigweed, Amaranthus retroflexus L. # AMAREsugarbeet, Beta vulgaris L. ‘HM 1605RR’, ‘HM 1640RR’, ‘Beta 1399LL’, ‘Beta 4546LL’Setaria viridisSETVISolanum sarrachoidesSOLSA
Type
Research
Information
Weed Technology , Volume 16 , Issue 1 , March 2002 , pp. 66 - 73
Copyright
Copyright © Weed Science Society of America 

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