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Dinitroaniline resistant annual bluegrass in North Carolina

Published online by Cambridge University Press:  20 January 2017

John Isgrigg III ,
Fred H. Yelverton ,
Cavell Brownie  and
Leon S. Warren Jr.
John Isgrigg III
Affiliation:
12001 Hadden Hall Drive, Chesterfield, VA 23838
Cavell Brownie
Affiliation:
Department of Statistics, North Carolina State University, Raleigh, NC 27695-8203
Leon S. Warren Jr.
Affiliation:
Crop Science Department, North Carolina State University, Raleigh, NC 27695-7620
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Abstract

Annual bluegrass control was reduced following 7 yr of continuous fall application of dinitroaniline (DNA) herbicides. Annual bluegrass control was < 40% on two fairways in year eight following prodiamine applied at 1.1 kg ai ha−1. In dose–response studies conducted in growth chambers, this annual bluegrass population exhibited 105-fold resistance in shoot growth to prodiamine compared with a known susceptible population. A 6.4-fold resistance to prodiamine was found when comparing annual bluegrass root growth to the known susceptible biotype. Spring-applied oxadiazon did not affect shoot or root growth between annual bluegrass biotypes. Equivalent levels of control were attained with pronamide. The presence of DNA-resistant annual bluegrass, in addition to previously confirmed triazine-resistant biotypes on North Carolina golf courses, indicates a need for resistance management strategies to be integrated into golf turf management practices.

Keywords

Oxadiazonprodiaminepronamideannual bluegrass, Poa annua L. POANNHerbicide resistancedinitroaniline resistance
Type
Research Article
Information
Weed Science , Volume 50 , Issue 1 , February 2002 , pp. 86 - 90
Copyright
Copyright © Weed Science Society of America 

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