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Weed Control from Herbicide Combinations with Glyphosate

Published online by Cambridge University Press:  20 January 2017

David R. Shaw  and
James C. Arnold
David R. Shaw*
Affiliation:
Department of Plant and Soil Sciences, Mississippi State University, P.O. Box 9555, Mississippi State, MS 39762
James C. Arnold
Affiliation:
Department of Plant and Soil Sciences, Mississippi State University, P.O. Box 9555, Mississippi State, MS 39762
*
Corresponding author's E-mail: dshaw@rstc.msstate.edu.
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Abstract

Greenhouse studies were initiated to evaluate glyphosate alone and tank-mixed with acifluorfen, CGA 277476, chlorimuron, cloransulam-methyl, fomesafen, imazaquin, or pyrithiobac on seedling johnsongrass, broadleaf signalgrass, pitted morningglory, and hemp sesbania. Johnsongrass and broadleaf signalgrass control by glyphosate was not affected by the selective herbicides applied in mixtures. Pitted morningglory control by glyphosate ranged from 0% with 280 g ai/ha to 67% with 840 g/ha. There was an additive effect when selective herbicides were added to 280 g/ha glyphosate 2 wk after treatment (WAT). When acifluorfen was added to 560 g/ha glyphosate, pitted morningglory control 2 WAT increased to 100% compared with 55% with glyphosate alone. Similarly, the addition of fomesafen or acifluorfen to 840 g/ha glyphosate controlled pitted morningglory 2 WAT by 90 and 98%, respectively, compared with 67% with glyphosate alone. Only tank mixtures of acifluorfen, CGA 277476, or fomesafen, and 840 g/ha glyphosate reduced fresh weight compared with glyphosate alone 4 WAT. Acifluorfen, CGA 277476, and fomesafen controlled pitted morningglory by 85 to 100% when added to 1,120 g/ha glyphosate. Both acifluorfen and fomesafen effectively controlled hemp sesbania without the addition of glyphosate 2 WAT. Chlorimuron and pyrithiobac added to 1,120 g/ha glyphosate increased hemp sesbania control to 88 and 99%, respectively, compared with 45% with glyphosate alone 2 WAT. CGA 277476, cloransulam-methyl, imazaquin, and pyrithiobac were antagonistic to hemp sesbania fresh weight reduction when compared with the expected response, but fresh weights were still reduced more than with the same rate of glyphosate alone.

Keywords

AcifluorfenCGA-277476, 2-[[[[(4,6-dimethyl-2-pyrimidinyl)amino]carbonyl]amino]sulfonyl]-3-oxetanyl esterchlorimuroncloransulam-methylfomesafenglyphosateimazaquinpyrithiobacbroadleaf signalgrass, Brachiaria platyphylla (Griseb.) Nash. #3 ECHCGhemp sesbania, Sesbania exaltata (Raf.) Rydb. ex. A. W. Hill # SEBEXjohnsongrass, Sorghum halepense (L.) Pers. # SORHApitted morningglory, Ipomoea lacunosa L. # IPOLAAdditive effects, herbicide antagonism, tank mixturesALS, acetolactate synthaseWAT, weeks after treatment
Type
Research
Information
Weed Technology , Volume 16 , Issue 1 , March 2002 , pp. 1 - 6
Copyright
Copyright © Weed Science Society of America 

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