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Weed Control in Low-Tannin Seedling Sericea Lespedeza (Lespedeza cuneata)

Published online by Cambridge University Press:  12 June 2017

Glenn Wehtje ,
Robert H. Walker  and
James D. Jones Jr.
Glenn Wehtje
Affiliation:
Department of Agronomy and Soils and Alabama Agricultural Experiment Station, Auburn University, Auburn, AL 36849-5412
Robert H. Walker*
Affiliation:
Department of Agronomy and Soils and Alabama Agricultural Experiment Station, Auburn University, Auburn, AL 36849-5412
James D. Jones Jr.
Affiliation:
Department of Agronomy and Soils and Alabama Agricultural Experiment Station, Auburn University, Auburn, AL 36849-5412
*
Corresponding author's E-mail: rwalker@acesag.auburn.edu.
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Abstract

Field trials were conducted to evaluate weed control and crop safety with postemergence-applied herbicides in two cultivars of low-tannin seedling sericea lespedeza (Lespedeza cuneata). Two applications of either 2,4-D amine at 0.28 kg ae/ha or 2,4-DB amine at 0.56 kg ae/ha controlled sicklepod (Senna obtusifolia) ≥ 90%. Equivalent control of smallflower morningglory (Jacquemontia tamnifolia) required either two applications of 2,4-D or three of 2,4-DB. Three applications of either herbicide were required for comparable spotted spurge (Euphorbia maculata) control. Sericea lespedeza was not adversely affected when either herbicide was applied up to three times per season over two consecutive seasons. Tolerance to 2,4-D and 2,4-DB was equal between two sericea lespedeza cultivars. Absorption of foliar-applied 14C-2,4-D was greater in sicklepod and smallflower morningglory than in sericea lespedeza. Translocation of absorbed 14C-2,4-D was equivalent between sicklepod and sericea lespedeza but greater in smallflower morningglory than in sericea lespedeza. Absorption and translocation of foliar-applied 14C-2,4-DB was equivalent between sicklepod and sericea lespedeza. Furthermore, 14C-2,4-DB absorption was less in smallflower morningglory than in sericea lespedeza.

Keywords

Amine salt of 2,4-D, (2,4-dichlorophenoxy)acetic acidamine salt of 2,4-DB, 4-(2,4-dichlorophenoxy)butanoic acidsmallflower morningglory, Jacquemontia tamnifolia (L.) Griseb. #IAQTAspotted spurge, Euphorbia maculata L. # EPHMAsicklepod, Senna obtusifolia (L.) Irwin and Barneby # CASOBsericea lespedeza, Lespedeza cuneata (Dumont) G. Don.Absorptiontranslocation2,4-D2,4-DBimazaquinfomesafen14C-2,4-D14C-2,4-DBCASOBEPHMAIAQTADAP, days after plantingPOST, postemergence
Type
Research
Information
Weed Technology , Volume 13 , Issue 2 , June 1999 , pp. 290 - 295
Copyright
Copyright © 1999 by the Weed Science Society of America 

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Footnotes

Current address of third author: Henry County Activities Building, Route 1 Box 120, Headland, AL 36345.

References

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