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A Waterhemp (Amaranthus tuberculatus) Population Resistant to 2,4-D

Published online by Cambridge University Press:  20 January 2017

Mark L. Bernards*
Affiliation:
Department of Agronomy and Horticulture, University of Nebraska–Lincoln, Lincoln, NE 68583
Roberto J. Crespo
Affiliation:
Department of Agronomy and Horticulture, University of Nebraska–Lincoln, Lincoln, NE 68583
Greg R. Kruger
Affiliation:
West Central Research and Extension Center, University of Nebraska–Lincoln, North Platte, NE 69101
Roch Gaussoin
Affiliation:
Department of Agronomy and Horticulture, University of Nebraska–Lincoln, Lincoln, NE 68583
Patrick J. Tranel
Affiliation:
Department of Crop Sciences, University of Illinois, Urbana, IL 61801
*
Corresponding author's E-mail: ml-bernards@wiu.edu

Abstract

A waterhemp population from a native-grass seed production field in Nebraska was no longer effectively controlled by 2,4-D. Seed was collected from the site, and dose-response studies were conducted to determine if this population was herbicide resistant. In the greenhouse, plants from the putative resistant and a susceptible waterhemp population were treated with 0, 18, 35, 70, 140, 280, 560, 1,120, or 2,240 g ae ha−1 2,4-D. Visual injury estimates (I) were made 28 d after treatment (DAT), and plants were harvested and dry weights (GR) measured. The putative resistant population was approximately 10-fold more resistant to 2,4-D (R:S ratio) than the susceptible population based on both I50 (50% visual injury) and GR50 (50% reduction in dry weight) values. The R:S ratio increased to 19 and 111 as the data were extrapolated to I90 and GR90 estimates, respectively. GR50 doses of 995 g ha−1 for the resistant and 109 g ha−1 for the susceptible populations were estimated. A field dose-response study was conducted at the suspected resistant site with 2,4-D doses of 0, 140, 280, 560, 1,120, 2,240, 4,480, 8,960, 17,920, and 35,840 g ha−1. At 28 DAT, visual injury estimates were 44% in plots treated with 35,840 g ha−1. Some plants treated with the highest rate recovered and produced seed. Plants from the resistant and susceptible populations were also treated with 0, 9, 18, 35, 70, 140, 280, 560, or 1,120 g ae ha−1 dicamba in greenhouse bioassays. The 2,4-D resistant population was threefold less sensitive to dicamba based on I50 estimates but less than twofold less sensitive based on GR50 estimates. The synthetic auxins are the sixth mechanism-of-action herbicide group to which waterhemp has evolved resistance.

Type
Weed Biology and Ecology
Copyright
Copyright © Weed Science Society of America 

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References

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