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Weed Management Using Reduced Rate Combinations of Diclosulam, Flumioxazin, and Imazapic in Peanut

Published online by Cambridge University Press:  20 January 2017

J. Tredaway Ducar ,
S. B. Clewis ,
J. W. Wilcut ,
D. L. Jordan ,
B. J. Brecke ,
W. J. Grichar ,
W. C. Johnson III  and
G. R. Wehtje
J. Tredaway Ducar*
Affiliation:
Department of Agronomy, University of Florida, Gainesville, FL 32611
S. B. Clewis
Affiliation:
Department of Crop Science, North Carolina State University, Raleigh, NC 27695-7620
J. W. Wilcut
Affiliation:
Department of Crop Science, North Carolina State University, Raleigh, NC 27695-7620
D. L. Jordan
Affiliation:
Department of Crop Science, North Carolina State University, Raleigh, NC 27695-7620
B. J. Brecke
Affiliation:
University of Florida West Florida Research and Education Center, Milton, FL 32583
W. J. Grichar
Affiliation:
Soil and Crop Department, Texas A&M University Agricultural Research Experiment Station, Beeville, TX 78102-9410
W. C. Johnson III
Affiliation:
USDA-ARS Crop Protection and Management Research Unit, Tifton, GA 31793-0748
G. R. Wehtje
Affiliation:
Agronomy and Soils Department, Auburn University, Auburn University, AL 36849-5412
*
Corresponding author's E-mail: ducarjt@auburn.edu.
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Abstract

Experiments were conducted during 2000 and 2001 at a total of 13 locations throughout Alabama, Georgia, Florida, North Carolina, and Texas to evaluate efficacy of herbicides at or below the manufacturer's suggested use rate. Herbicide applications included diclosulam and flumioxazin applied PRE alone or followed by imazapic applied early postemergence (EPOST). All possible combinations of diclosulam at 0, 13.5, or 27 g ai/ha and flumioxazin at 0, 53, or 105 g ai/ha applied PRE were included. Imazapic was applied at 35 g ai/ha. Ivyleaf morningglory was controlled more than 87% when imazapic was applied EPOST regardless of PRE herbicide. Pitted morningglory control > 67% was observed with applications of diclosulam (27 g/ha) followed by imazapic, diclosulam (13.5 g/ha) plus flumioxazin (53 g/ha), diclosulam (13.5 g/ha) plus flumioxazin (105 g/ha), and diclosulam (27 g/ha) plus flumioxazin (105 g/ha). Sicklepod was controlled more than 74% with flumioxazin (53 g/ha) followed by imazapic and diclosulam (27 g/ha) plus flumioxazin (105 g/ha) followed by imazapic. Florida beggarweed was controlled more than 84% by all PRE herbicide combinations except flumioxazin (53 g/ha) alone or diclosulam (27 g/ha) alone or with imazapic. Yellow nutsedge was controlled at least 90% with diclosulam at either rate followed by imazapic and by diclosulam plus flumioxazin followed by imazapic regardless of rate. Pod yield was generally higher when herbicides were applied regardless of herbicide combination or rate. Peanut yield was maximized with the lowest rates of flumioxazin or diclosulam PRE followed by imazapic EPOST.

Keywords

Diclosulamflumioxazinimazapic2,4-DBFlorida beggarweed, Desmodium tortuosum (Sw.) DC. DEDTOivyleaf morningglory, Ipomoea hederacea Jacq. IPOHEpitted morningglory, Ipomoea lacunosa L. IPOLAsicklepod, Senna obtusifolia (L.) H.S. Irwin and Barneby CASOByellow nutsedge, Cyperus esculentus L., CYPESpeanut, Arachis hypogaea L., ‘Georgia Green’, ‘NC 12C’, ‘VA 98R’Herbicide rateFlorida beggarweedivyleaf morningglorypeanutpitted morningglorysicklepodyellow nutsedge
Type
Weed Management—Major Crops
Information
Weed Technology , Volume 23 , Issue 2 , June 2009 , pp. 236 - 242
Copyright
Copyright © Weed Science Society of America 

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