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Interaction of Glyphosate and 2,4-DB for the Control of Selected Morningglory (Ipomoea spp.) Species

Published online by Cambridge University Press:  12 June 2017

Glenn Wehtje  and
Robert H. Walker
Glenn Wehtje
Affiliation:
Department of Agronomy and Soils, Auburn University, Auburn AL 36849
Robert H. Walker
Affiliation:
Department of Agronomy and Soils, Auburn University, Auburn AL 36849
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Abstract

Interaction of glyphosate and 2,4-DB was evaluated in greenhouse and laboratory studies with respect to control of four species of annual morningglory. The greenhouse study included smallflower, pitted, palmleaf, and ivyleaf morningglory at three growth stages: seedling, juvenile, and vining. A series of glyphosate rates (0.28 to 1.26 kg ae/ha) and 2,4-DB (0.022 and 0.045 kg ae/ha) were applied alone, and in all possible two-way tank mixtures. Morningglory response to both glyphosate and 2,4-DB applied alone was species- and growth stage-dependent. All combinations were either additive or synergistic for control of pitted, palmleaf, and ivyleaf morningglory. Response of smallflower morningglory ranged from antagonistic to synergistic. Absorption and translocation of 14C-2,4-DB was independent of the addition of glyphosate in all four species. By contrast, absorption of foliar-applied 14C-glyphosate and translocation of 14C from treated leaves to other plant parts were enhanced by the addition of 2,4-DB in all species except palmleaf morningglory. In palmleaf morningglory, 14C-glyphosate absorption and translocation were independent of the addition of 2,4-DB. Absorption and translocation data were in agreement with greenhouse studies.

Keywords

2,4-DB, 4-(2,4-dichlorophenoxy)butanoic acidglyphosate, N-(phosphonomethyl)glycineivyleaf morningglory, Ipomoea hederacea (L). Jacg. # IPOHEpalmleaf morningglory, Ipomoea wrightii Gray # IPOWRpitted morningglory, Ipomoea lacunosa L. # IPOLAsmallflower morningglory Jacquemontia tamnifolia (L.) Griseb. # IAQTAAbsorptionherbicide interactionsherbicide mixturestranslocation14C-glyphosate14C-2,4-DBIPOHEIPOWRIPOLAIAQTA
Type
Research
Information
Weed Technology , Volume 11 , Issue 1 , March 1997 , pp. 152 - 156
Copyright
Copyright © 1997 by the Weed Science Society of America 

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References

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