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Herbicide-resistant Weeds in Australia

Published online by Cambridge University Press:  12 June 2017

Stephen B. Powles  and
Peter D. Howat
Stephen B. Powles
Affiliation:
Dep. Agron., Waite Agric. Res. Inst., Univ. Adelaide, Glen Osmond, South Australia 5064
Peter D. Howat
Affiliation:
Dep. Agron., Waite Agric. Res. Inst., Univ. Adelaide, Glen Osmond, South Australia 5064
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Abstract

This review considers the development of herbicide-resistant weed biotypes in Australia. Biotypes of the important annual weed species, capeweed, wall barley, and hare barley are resistant to the bipyridylium herbicides paraquat and diquat. These resistant biotypes developed on a small number of alfalfa fields that have a long history of paraquat and diquat use within a distinct geographical area in central western Victoria. The resistant biotypes are controlled by alternative herbicides and pose little practical concern. Some populations of wild oat are resistant to the methyl ester of diclofop. Of greatest concern is the development of cross resistance in biotypes of rigid ryegrass to aryloxyphenoxypropionate, cyclohexanedione, sulfonylurea, and dinitroaniline herbicides. The cross-resistant rigid ryegrass infests crops and pastures at widely divergent locales throughout the cropping zones of southern Australia. The options for control of cross-resistant rigid ryegrass by herbicides are limited. A biotype of rigid ryegrass on railway tracks treated for 10 yr with amitrole plus atrazine has resistance to amitrole and atrazine and other triazine, triazinone, and phenylurea herbicides. Management tactics for cross resistance are discussed.

Keywords

Amitrole, 1H-1,2,4-triazol-3-amineatrazine, 6-chloro-N-ethyl-N′-(1-methylethyl)-1,3,5-triazine-2,4-diaminediclofop, (±)-2-[4-(2,4-dichlorophenoxy)phenoxy]propanoic aciddiquat, 6,7-dihydrodipyrido[1,2-α:2’,1′-c] pyrazinediium ionparaquat, 1,1′-dimethyl-4,4′-bipyridinium ionalfalfa, Medicago sativa L.rigid ryegrass, Lolium rigidum Gaud. ♯3 LOLRIcapeweed, Arctotheca calendula (L.)Levyns. ♯ AROCAhare barley, Hordeum leporinum Link. ♯ HORLEwall barley, Hordeum glaucum Steud. ♯ HORMCwild oat, Avena fatua L. ♯ AVEFACross resistanceannual ryegrass Arctotheca calendulaAvena fatuaHordeum glaucumHordeum leporinumLolium rigidumAROCAAVEFAHORLEHORMCLOLRI
Type
Symposium
Information
Weed Technology , Volume 4 , Issue 1 , March 1990 , pp. 178 - 185
Copyright
Copyright © 1990 Weed Science Society of America 

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References

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