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1 January 2004 Multiple-herbicide resistance across four modes of action in wild radish (Raphanus raphanistrum)
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Abstract

Populations of wild radish were collected from two fields in the northern Western Australian wheatbelt, where typical herbicide-use patterns had been practiced for the previous 17 seasons within an intensive crop production program. The herbicide resistance status of these populations clearly established that there was multiple-herbicide resistance across many herbicides from at least four modes of action. One population exhibited multiple-herbicide resistance to the phytoene desaturase (PDS)–inhibiting herbicide diflufenican (3.0-fold), the auxin analog herbicide 2,4-D (2.2-fold), and the photosystem II–inhibiting herbicides metribuzin and atrazine. Another population was found to be multiply resistant to the acetolactate synthase–inhibiting herbicides, the PDS-inhibiting herbicide diflufenican (2.5-fold), and the auxin analog herbicide 2,4-D amine (2.4-fold). Therefore, each population has developed multiple-herbicide resistance across several modes of action. The multiple resistance status of these wild radish populations developed from conventional herbicide usage in intensive cropping rotations, indicating a dramatic challenge for the future control of wild radish.

Nomenclature: Atrazine; 2,4-D amine; diflufenican; metribuzin; wild radish, Raphanus raphanistrum L.

Michael J. Walsh, Stephen B. Powles, Brett R. Beard, Ben T. Parkin, and Sally A. Porter "Multiple-herbicide resistance across four modes of action in wild radish (Raphanus raphanistrum)," Weed Science 52(1), 8-13, (1 January 2004). https://doi.org/10.1614/WS-03-016R
Received: 21 January 2003; Accepted: 1 June 2003; Published: 1 January 2004
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