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1 January 2002 Dinitroaniline resistant annual bluegrass in North Carolina
John Isgrigg III, Fred H. Yelverton, Cavell Brownie, Leon S. Warren
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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.

Nomenclature: Oxadiazon; prodiamine; pronamide; annual bluegrass, Poa annua L. POANN.

John Isgrigg III, Fred H. Yelverton, Cavell Brownie, and Leon S. Warren "Dinitroaniline resistant annual bluegrass in North Carolina," Weed Science 50(1), 86-90, (1 January 2002).[0086:DRABIN]2.0.CO;2
Received: 22 April 1999; Accepted: 30 September 2001; Published: 1 January 2002

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