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22 October 2019 No Auxinic Herbicide–Resistance Cost in Wild Radish (Raphanus raphanistrum)
Danica E. Goggin, Hugh J. Beckie, Chad Sayer, Stephen B. Powles
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Wild radish (Raphanus raphanistrum L.) is a problematic and economically damaging dicotyledonous weed infesting crops in many regions of the world. Resistance to the auxinic herbicides 2,4-D and dicamba is widespread in Western Australian R. raphanistrum populations, with the resistance mechanism appearing to involve alterations in the physiological response to synthetic auxins and in plant defense. This study aimed to determine whether these alterations cause inhibition in plant growth or reproduction that could potentially be exploited to manage 2,4-D–resistant populations in cropping areas. Therefore, the morphology and seed production of resistant and susceptible populations were compared in an outdoor pot study, with plants grown in the presence and absence of competition by wheat (Triticum aestivum L.). The susceptible and resistant R. raphanistrum populations were equally suppressed by wheat competition, with plant growth and seed production being decreased by approximately 50%. Although resistant populations produced less vegetative biomass than susceptible populations, there was no negative association between resistance and seed production. Therefore, it is unlikely that any nonherbicidal management practices will be more efficacious on 2,4-D–resistant than 2,4-D–susceptible R. raphanistrum populations.

© Weed Science Society of America, 2019.
Danica E. Goggin, Hugh J. Beckie, Chad Sayer, and Stephen B. Powles "No Auxinic Herbicide–Resistance Cost in Wild Radish (Raphanus raphanistrum)," Weed Science 67(5), 539-545, (22 October 2019).
Received: 8 April 2019; Accepted: 26 July 2019; Published: 22 October 2019
seed dormancy
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