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Diuron-resistant Poa annua is resistant to norflurazon

Published online by Cambridge University Press:  20 January 2017

Bradley D. Hanson  and
Carol A. Mallory-Smith
Carol A. Mallory-Smith
Affiliation:
Department of Crop and Soil Science, Oregon State University, Corvallis, OR 97331-3002
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Abstract

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.

Keywords

DiuronnorflurazonPoa annua L. POAAN, annual bluegrassLolium perenne L. LOLPE, perennial ryegrassGR50resistanceR/S ratio
Type
Rapid Publication
Information
Weed Science , Volume 48 , Issue 6 , December 2000 , pp. 666 - 668
Copyright
Copyright © Weed Science Society of America 

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