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Annual Grass Control in Peanut (Arachis hypogaea) with Clethodim and Imazapic

Published online by Cambridge University Press:  20 January 2017

Ian C. Burke ,
Andrew J. Price ,
John W. Wilcut ,
David L. Jordan ,
A. Stanley Culpepper  and
Joyce Tredaway-Ducar
Ian C. Burke
Affiliation:
Box 7620, Crop Science Department, North Carolina State University, Raleigh, NC 27695
Andrew J. Price
Affiliation:
Box 7620, Crop Science Department, North Carolina State University, Raleigh, NC 27695
John W. Wilcut
Affiliation:
Box 7620, Crop Science Department, North Carolina State University, Raleigh, NC 27695
David L. Jordan*
Affiliation:
Box 7620, Crop Science Department, North Carolina State University, Raleigh, NC 27695
A. Stanley Culpepper
Affiliation:
Department of Soil and Crop Science, University of Georgia, P.O. Box 1209, Tifton, GA 31793
Joyce Tredaway-Ducar
Affiliation:
Department of Agronomy, University of Florida, Gainesville, FL 32611
*
Corresponding author's E-mail: david_jordan@ncsu.edu
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Abstract

Field experiments were conducted to evaluate possible interactions of clethodim with imazapic applied as mixtures or sequentially for control of broadleaf signalgrass, fall panicum, goosegrass, and large crabgrass. Imazapic at 70 g ai/ha alone controlled grass weeds inconsistently, whereas clethodim at 140 g ai/ha alone controlled the same weeds at least 99%. Imazapic did not affect broadleaf signalgrass control by clethodim. Reduced control of fall panicum, goosegrass, and large crabgrass was observed when clethodim and imazapic were applied in mixture. Antagonism of clethodim occurred when clethodim was applied 1 d before or up to 3 d after application of imazapic (fall panicum and large crabgrass). Antagonism of goosegrass control was noted when imazapic was applied 3 d before or up to 7 d after application of clethodim. In other experiments, large crabgrass and Texas panicum control by clethodim (70 and 140 g/ha) applied alone or with imazapic (70 g/ ha) or bentazon (1.1 kg ai/ha) plus 2,4-DB (0.28 kg ai/ha) either with or without ammonium sulfate (2.8 kg/ha) was evaluated. Texas panicum control by clethodim was reduced by imazapic regardless of the ammonium sulfate rate. However, large crabgrass control by imazapic was not affected in these experiments. Control of both grasses by clethodim was reduced substantially by bentazon plus 2,4-DB, although in some instances ammonium sulfate improved control when in mixture. Ammonium sulfate improved control by clethodim in some instances irrespective of the broadleaf–sedge herbicide treatments.

Keywords

Bentazonclethodim2,4-DBimazapicbroadleaf signalgrass, Brachiaria platyphylla (Griseb) Nash #3 BRAPPfall panicum, Panicum dichotomiflorum L. # PANDIgoosegrass, Eleusine indica L. Gaertn. # ELEINlarge crabgrass, Digitaria sanguinalis L. Scop. # DIGSATexas panicum, Panicum texanum Buckl. # PANTEAmmonium sulfateantagonismherbicide compatibilityherbicide interactionsequential application
Type
Research
Information
Weed Technology , Volume 18 , Issue 1 , March 2004 , pp. 88 - 92
Copyright
Copyright © Weed Science Society of America 

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