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Sicklepod (Senna obtusifolia) and Red Morningglory (Ipomoea coccinea) Control in Glyphosate-Resistant Soybean with Narrow Rows and Postemergence Herbicide Mixtures

Published online by Cambridge University Press:  20 January 2017

Timothy L. Grey  and
Paul Raymer
Timothy L. Grey*
Affiliation:
Department of Crop and Soil Sciences, The University of Georgia, Coastal Plain Experiment Station, P.O. Box 748, Tifton, GA 31793, and Georgia Experiment Station, 1109 Experiment Street, Griffin, GA 30223
Paul Raymer
Affiliation:
Department of Crop and Soil Sciences, The University of Georgia, Coastal Plain Experiment Station, P.O. Box 748, Tifton, GA 31793, and Georgia Experiment Station, 1109 Experiment Street, Griffin, GA 30223
*
Corresponding author's E-mail: [email protected]
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Abstract

Field studies were conducted over 2 yr to evaluate weed control, yield, and net returns of glyphosate-resistant soybean using total postemergence (5 wk) (POST) herbicide systems with glyphosate–isopropylamine (Ipa) or glyphosate–trimethylsulfonium (Tms) alone, tank mixed with fomesafen, or in sequential treatments with bentazon, fomesafen, Ipa, or Tms. Soybean early-season injury ranged from 0 to 28% across the test. Although Ipa did not injure soybean, glyphosate–Tms early postemergence (3 wk) (EPOST) injured soybean from 7 to 17% depending on the rate. Glyphosate–Tms mixed with fomesafen EPOST injured soybean from 20 to 28%. Red morningglory control by Ipa and Tms at 0.8 kg ae/ha was no more than 88%. Sequential applications of Tms or Ipa controlled red morningglory 78% or less. Fomesafen improved red morningglory control by Ipa and Tms. Bentazon did not affect the control of red morningglory by these herbicides. Sicklepod, smooth pigweed, and large crabgrass control was 81, 93, and 79%, respectively, or greater for all herbicide treatments. By midseason, narrow-row soybeans had canopied, and competition from weeds was minimal. Overall, the net returns were reflective of soybean yield, and maximum net returns were recorded for treatments with reduced herbicide inputs. Conversely, sequential application of herbicides as EPOST followed by POST treatments resulted in lower net returns because of increased herbicide and application costs.

Keywords

Bentazonfomesafenglyphosate–isopropylamineglyphosate–trimethylsulfoniumlarge crabgrass, Digitaria sanguinalis (L.) Scop. #3 DIGSAred morningglory, Ipomoea coccinea L. # IPOCCsicklepod, Senna obtusifolia (L.) Irwin and Barnaby # CASOBsmooth pigweed, Amaranthus hybridus L. # AMACHsoybean, Glycine max (L.) MerrAMACHAmaranthus hybridusCASOBDigitaria sanguinalisDIGSAGlycine maxherbicide-resistant cropsIPOCCIpomoea coccineanet returnsRoundup-Ready® soybeanSenna obtusifoliasoybean injurysoybean yieldsulfosateEPOST, early postemergence (3 wk)fb, followed byIpa, isopropylaminePOST, postemergence (5 wk)Tms, trimethylsulfonium
Type
Note
Information
Weed Technology , Volume 16 , Issue 3 , September 2002 , pp. 669 - 674
Copyright
Copyright © Weed Science Society of America 

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