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Effect of Brown Patch (Caused by Rhizoctonia solani) Control on Preemergence Herbicide Efficacy in Tall Fescue (Festuca arundinacea)

Published online by Cambridge University Press:  20 January 2017

Jason A. Ferrell ,
Tim R. Murphy ,
Leon L. Burpee  and
William K. Vencill
Jason A. Ferrell*
Affiliation:
Department of Crop and Soil Sciences, University of Georgia, Athens, GA 30602
Tim R. Murphy
Affiliation:
Department of Crop and Soil Sciences, University of Georgia, Athens, GA 30602
Leon L. Burpee
Affiliation:
Department of Plant Pathology, University of Georgia, Athens, GA 30602
William K. Vencill
Affiliation:
Department of Crop and Soil Sciences, University of Georgia, Athens, GA 30602
*
Corresponding author's E-mail: jferrell@uga.edu
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Abstract

Field studies evaluated the effect of brown patch control on preemergence herbicide efficacy in tall fescue. Pendimethalin (1.7 followed by [fb] 1.7; 3.4 kg ai/ha), prodiamine (0.7 fb 0.6; 1.3 kg ai/ha), and oxadiazon (2.2 fb 2.2; 4.5 kg/ha), applied sequentially and as a single application, were evaluated for smooth crabgrass control with and without the use of azoxystrobin, a fungicide that controls brown patch. Azoxystrobin suppressed brown patch and increased smooth crabgrass control with pendimethalin in both years. This enhanced efficacy with azoxystrobin was attributed to improved tall fescue turf density and thus increased competition between this turf species and smooth crabgrass. Longer soil-residual herbicides such as oxadiazon and prodiamine provided high levels of smooth crabgrass control (often >90%). With the exception of oxadiazon at 4.5 kg ai/ha in 2000, smooth crabgrass control with oxadiazon and prodiamine was unaffected by the use of azoxystrobin.

Keywords

Azoxystrobin, methyl (E)-2-((6-(2-cyanophenoxy)-4-pyrimidinyl)oxy)-alpha-(methoxymethylene)benzeneacetateoxadiazonpendimethalinprodiaminesmooth crabgrass, Digitaria ischaemum Schreb. ex. Schweig. #3 DIGIStall fescue, Festuca arundinacea Schreb. # FESAR ‘Ky 31’Soil persistencefb, followed byPRE, preemergence
Type
Research
Information
Weed Technology , Volume 17 , Issue 4 , December 2003 , pp. 747 - 750
Copyright
Copyright © Weed Science Society of America 

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