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Resistance to Aryloxyphenoxypropionate Herbicides in Two Wild Oat Species (Avena fatua and Avena sterilis ssp. ludoviciana)

Published online by Cambridge University Press:  12 June 2017

Ali M. Mansooji ,
Joseph A. Holtum ,
Peter Boutsalis ,
John M. Matthews  and
Stephen B. Powles
Ali M. Mansooji
Affiliation:
Dep. Crop Prot., Waite Agric. Res. Inst., Univ. Adelaide, P.O. Bag 1, Glen Osmond, South Australia 5064, Australia
Joseph A. Holtum
Affiliation:
Dep. Crop Prot., Waite Agric. Res. Inst., Univ. Adelaide, P.O. Bag 1, Glen Osmond, South Australia 5064, Australia
Peter Boutsalis
Affiliation:
Dep. Crop Prot., Waite Agric. Res. Inst., Univ. Adelaide, P.O. Bag 1, Glen Osmond, South Australia 5064, Australia
John M. Matthews
Affiliation:
Dep. Crop Prot., Waite Agric. Res. Inst., Univ. Adelaide, P.O. Bag 1, Glen Osmond, South Australia 5064, Australia
Stephen B. Powles
Affiliation:
Dep. Crop Prot., Waite Agric. Res. Inst., Univ. Adelaide, P.O. Bag 1, Glen Osmond, South Australia 5064, Australia
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Abstract

Resistance to the methyl ester of diclofop, an aryloxyphenoxypropionate graminicide, was shown for a wild oat (Avena fatua) population from Western Australia, and marked resistance to a range of aryloxyphenoxypropionate and cyclohexanedione graminicides was detected in a winter wild oat (Avena sterilis ssp. ludoviciana) population from South Australia. The A. sterilis biotype exhibited high levels of resistance to the aryloxyphenoxypropionate herbicides diclofop, fluazifop, haloxyfop, fenoxaprop, quizalofop, propaquizafop, and quinfurop and low levels of resistance to the cyclohexanedione herbicides sethoxydim, tralkoxydim, and cycloxydim. Ratios of LD50 values for responses of resistant and susceptible A. sterilis to the aryloxyphenoxypropionate herbicides were between 20 for propaquizafop and > 1,000 for fluazifop, and were between 2.5 and 3 for the cyclohexanedione herbicides. The LD50 value for diclofop for the A. fatua biotype was 442 g ai ha-1 which was 2.7-fold that of a susceptible control. Thirty-three percent of the plants survived at the registered rate of application.

Keywords

diclofop, (±)-2-[4-(2,4-dichlorophenoxy)phenoxy]propanoic acidfenoxaprop, (±)-2-[4-[(6-chloro-2-benzoxazolyl)oxy]phenoxy]propanoic acidquizalofop, (±)-2-[4-[(6-chloro-2-quinoxalinyl)oxy]phenoxy]propanoic acidwild oats, Avena fatua L. #3 AVEFAHerbicide resistancecross-resistancecyclohexanedioneAVEFAAVELU
Type
Weed Control and Herbicide Technology
Information
Weed Science , Volume 40 , Issue 4 , December 1992 , pp. 599 - 605
Copyright
Copyright © 1992 by the Weed Science Society of America 

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