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Detection of Fenoxaprop-Resistant Smooth Crabgrass (Digitaria ischaemum) in Turf

Published online by Cambridge University Press:  20 January 2017

Jeffrey F. Derr
Jeffrey F. Derr*
Affiliation:
Department of Plant Pathology, Physiology and Weed Science, Virginia Polytechnic Institute and State University, Hampton Roads Agricultural Research and Extension Center, Virginia Beach, VA 23455
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Abstract

Greenhouse studies verified that smooth crabgrass from a golf course tee in southern New Jersey was resistant to fenoxaprop-P, although smooth crabgrass from a nearby untreated rough was susceptible to this herbicide. Fenoxaprop-P-resistant plants were injured, however, when fenoxaprop-P was applied at levels above the maximum use rate for turf. Fenoxaprop-P applied postemergence at 0.76 kg ai/ha, four times the maximum rate, reduced shoot weight of the resistant biotype by 35%, whereas application of 1.52 kg/ha, eight times the maximum rate, reduced shoot weight by 64%. Large crabgrass and the susceptible biotype of smooth crabgrass were controlled by fenoxaprop-P applied at 0.1 kg/ha. Fenoxaprop-susceptible and -resistant biotypes of smooth crabgrass had a similar response to MSMA, dithiopyr, and quinclorac applied postemergence. The fenoxaprop-P–resistant smooth crabgrass biotype was controlled by the cyclohexanedione herbicides sethoxydim and clethodim, but the aryloxyphenoxypropionate herbicides fluazifop and quizalofop reduced shoot weight by only 15 to 66% depending on herbicide and rate.

Keywords

Clethodimdithiopyrfenoxaprop-Pfluazifop-PMSMAquincloracquizalofopsethoxydimlarge crabgrass, Digitaria sanguinalis (L.) Scop. #3 DIGSAsmooth crabgrass, Digitaria ischaemum Schreb. Ex Muhl # DIGSUHerbicide resistancepostemergence grass herbicidesturfgrassACCase, acetyl-coenzyme A carboxylaseAPP, aryloxyphenoxypropionateCHD, cyclohexanedionesmooth crabgrass (R), fenoxaprop-P–resistant smooth crabgrasssmooth crabgrass (S), fenoxaprop-P–susceptible smooth crabgrassWAT, weeks after treatment
Type
Research
Information
Weed Technology , Volume 16 , Issue 2 , June 2002 , pp. 396 - 400
Copyright
Copyright © Weed Science Society of America 

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