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Weed Control in Sericea Lespedeza with Imazethapyr

Published online by Cambridge University Press:  20 January 2017

Glenn Wehtje  and
Jorge A. Mosjidis
Glenn Wehtje*
Affiliation:
Agronomy and Soils Department, Auburn University, Auburn University, AL 36849-5412
Jorge A. Mosjidis
Affiliation:
Agronomy and Soils Department, Auburn University, Auburn University, AL 36849-5412
*
Corresponding author's E-mail: wehtjgr@auburn.edu
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Abstract

Field studies were conducted to determine the feasibility of using imazethapyr applied preemergence (PRE) and postemergence (POST) for weed control in sericea lespedeza. In the POST experiment, imazethapyr was applied at 0, 71, 142, and 213 g ai/ha to mature, recently mowed stands of sericea lespedeza. Regardless of rate, yellow nutsedge and cutleaf groundcherry control at 2 mo after treatment, as determined by weed foliage biomass relative to the nontreated plants, was 90 and 80%, respectively. Sericea lespedeza forage yield (weeds removed) was not reduced by POST-applied imazethapyr even at 213 g/ha. The same imazethapyr rates were used with newly seeded sericea lespedeza in the PRE-applied experiment. Imazethapyr at 71 g/ha provided at least 78% control of large crabgrass, stinkgrass, yellow nutsedge, sicklepod, and cutleaf groundcherry as well as maximum sericea lespedeza performance, as indicated by seedling height, weight, and stand count. Results indicated that imazethapyr can be used for either PRE- or POST-applied weed control in sericea lespedeza. However, margin of safety is greater with imazethapyr applied POST to mature stands than with PRE applications to germinating seeds.

Keywords

Imazethapyrcutleaf groundcherry, Physalis angulata L. # PHYANlarge crabgrass, Digitaria sanguinalis (L.) Scop. # DIGSAsericea lespedeza, Lespedeza cuneata (Dumont) G. Donsicklepod, Senna obtusifolia (L.) Irwin and Barnaby # CASOBstinkgrass, Eragrostis cilianensis (All.) E. Mosher # ERACNyellow nutsedge, Cyperus esculentus L. # CYPESForagelegumePOST, postemergencePRE, preemergence
Type
Research Article
Information
Weed Technology , Volume 19 , Issue 3 , September 2005 , pp. 749 - 752
Copyright
Copyright © Weed Science Society of America 

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References

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