A biotype of hare barley (Hordeum leporinum) resistant to paraquat and diquat

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dc.creatorTucker, E.S.
dc.creatorPowles, S.B.
dc.date1991-06
dc.date2019-06-25T17:08:59Z
dc.date2019-06-25T17:08:59Z
dc.date.accessioned2026-06-27T15:53:54Z
dc.descriptionA biotype of the annual grass weed hare barley infesting an alfalfa field with a 24-yr history of the use of the bipyridylium herbicides paraquat and diquat, was investigated for resistance to these herbicides. Rates of up to 800 g ai ha–1 of each herbicide caused no mortality in the hare barley plants from this field. The same species, collected from an adjacent pasture field with no history of bipyridylium herbicide application, exhibited LD50's of 57 and 160 g ai ha–1 for paraquat and diquat, respectively. Tiller numbers and dry matter production in the biotype from the alfalfa field were not affected by the normal rate recommended for both herbicides. These results clearly show that hare barley from the alfalfa field is resistant to paraquat and diquat. Both biotypes were equally sensitive to fluazifop, glyphosate, and sethoxydim.
dc.identifierhttps://hdl.handle.net/10568/101698
dc.identifier.urihttp://hdl.handle.net/123456789/116767
dc.languageen
dc.publisherCambridge University Press
dc.rightsLimited Access
dc.sourceTucker, E.S. & Powles, S.B. (1991). A biotype of hare barley (Hordeum leporinum) resistant to paraquat and diquat. Weed Science, 39(2), 159-162.
dc.subjectinfestation
dc.subjectherbicides
dc.subjectmortality
dc.subjecttillering
dc.subjectproduction
dc.subjectdry matter
dc.subjectfluazifop
dc.subjectglyphosate
dc.subjectsethoxydim
dc.titleA biotype of hare barley (Hordeum leporinum) resistant to paraquat and diquat
dc.typeJournal Article

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Instituto Internacional de Agricultura Tropical (IITA)