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Control of Five Broadleaf Weeds in Sugarbeets (Beta vulgaris) with Glyphosate

Published online by Cambridge University Press:  12 June 2017

Edward E. Schweizer  and
Larry D. Bridge
Edward E. Schweizer
Affiliation:
Presently: Res. Assoc, Monsanto Agric. Prod. Co., St. Louis, MO 63166
Larry D. Bridge
Affiliation:
Presently: Res. Assoc, Monsanto Agric. Prod. Co., St. Louis, MO 63166
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Abstract

Field experiments were conducted to study the feasibility of applying glyphosate [N-(phosphonomethyl) glycine] postemergence with a recirculating sprayer and a vertical roller for the control of common lambsquarters (Chenopodium album L.), common sunflower (Helianthus annuus L.), kochia [Kochia scoparia (L.) Schrad.], redroot pigweed (Amaranthus retroflexus L.), and velvetleaf (Abutilon theophrasti Medic.) in sugarbeets (Beta vulgaris L.). Glyphosate was applied twice each year at 1.7 kg/ha with a recirculating sprayer in 1977 and 1978, or twice as a 20% (v/v) solution with a vertical-roller applicator in 1979. By harvest, 70 to 74% of the total population of treated common sunflower, kochia, and redroot pigweed, 61% of the common lambsquarters, and 30% of the velvetleaf was dead. Root yields in glyphosate-treated plots, when averaged over 3 yr, were increased 5800, 8500, 12 500, and 13400 kg/ha at densities of 6, 12, 18, and 24 broadleaf weeds (equal densities of common lambsquarters, kochia, and redroot pigweed)/30m of row, respectively. Where equal densities of common sunflower and velvetleaf competed with sugarbeets, root yields in glyphosate-treated plots, when averaged over 2 yr, were increased 4400, 11900, 11700, and 10700 kg/ha, respectively, at these same densities.

Keywords

Chenopodium albumHelianthus annuusKochia scopariaAmaranthus retroflexusAbutilon theophrastiweed lossescompetition
Type
Research Article
Information
Weed Science , Volume 30 , Issue 3 , May 1982 , pp. 291 - 296
Copyright
Copyright © 1982 by the Weed Science Society of America 

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References

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