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1 November 2000 Rapid PublicationDiuron-resistant Poa annua is resistant to norflurazon
Bradley D. Hanson, Carol A. Mallory-Smith
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Poa annua control with norflurazon was different between two field trials in 1999. At the field site with suspected diuron-resistant P. annua, control was less than at the site with known diuron-susceptible P. annua. Diuron-resistant and -susceptible biotypes of P. annua were subjected to a range of norflurazon rates in the greenhouse. The diuron-resistant P. annua biotype (R/S : of 2.5) was collected in 1995 from a Lolium perenne L. seed production field near Tangent, OR. The R/S : for norflurazon in these experiments was 4.8; thus, confirming that diuron-resistant P. annua is resistant to norflurazon.

Nomenclature: Diuron; norflurazon; Poa annua L. POAAN, annual bluegrass; Lolium perenne L. LOLPE, perennial ryegrass.

Bradley D. Hanson and Carol A. Mallory-Smith "Rapid PublicationDiuron-resistant Poa annua is resistant to norflurazon," Weed Science 48(6), 666-668, (1 November 2000).[0666:RPRPAI]2.0.CO;2
Received: 2 May 2000; Published: 1 November 2000
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