Weed Technology (2016) 30, 67-75

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Christopher J. Meyer, Jason K. Norsworthy, Bryan G. Young, Lawrence E. Steckel, Kevin W. Bradley, William G. Johnson, Mark M. Loux, Vince M. Davis, Greg R. Kruger, Mohammad T. Bararpour, Joseph T. Ikley, Douglas J. Spaunhorst and Thomas R. Butts (2016)
Early-season Palmer amaranth and waterhemp control from preemergence programs utilizing 4-hydroxyphenylpyruvate dioxygenase–inhibiting and auxinic herbicides in soybean
Weed Technology 30 (1), 67-75
Abstract: Palmer amaranth and waterhemp have become increasingly troublesome weeds throughout the United States. Both species are highly adaptable and emerge continuously throughout the summer months, presenting the need for a residual PRE application in soybean. To improve season-long control of Amaranthus spp., 19 PRE treatments were evaluated on glyphosate-resistant Palmer amaranth in 2013 and 2014 at locations in Arkansas, Indiana, Nebraska, Illinois, and Tennessee; and on glyphosate-resistant waterhemp at locations in Illinois, Missouri, and Nebraska. The two Amaranthus species were analyzed separately; data for each species were pooled across site-years, and site-year was included as a random variable in the analyses. The dissipation of weed control throughout the course of the experiments was compared among treatments with the use of regression analysis where percent weed control was described as a function of time (the number of weeks after treatment [WAT]). At the mean (i.e., average) WAT (4.3 and 3.2 WAT for Palmer amaranth and waterhemp, respectively) isoxaflutole + S-metolachlor + metribuzin had the highest predicted control of Palmer amaranth (98%) and waterhemp (99%). Isoxaflutole + S-metolachlor + metribuzin, S-metolachlor + mesotrione, and flumioxazin + pyroxasulfone had a predicted control > 97% and similar model parameter estimates, indicating control declined at similar rates for these treatments. Dicamba and 2,4-D provided some, short-lived residual control of Amaranthus spp. When dicamba was added to metribuzin or S-metolachlor, control increased compared to dicamba alone. Flumioxazin + pyroxasulfone, a currently labeled PRE, performed similarly to treatments containing isoxaflutole or mesotrione. Additional sites of action will provide soybean growers more opportunities to control these weeds and reduce the potential for herbicide resistance.
(The abstract is excluded from the Creative Commons licence and has been copied with permission by the publisher.)
Link to article at publishers website
Database assignments for author(s): Kevin W. Bradley, Mark M. Loux, Bryan G. Young

Research topic(s) for pests/diseases/weeds:
control - general
pesticide resistance of pest


Pest and/or beneficial records:

Beneficial Pest/Disease/Weed Crop/Product Country Quarant.


Amaranthus palmeri (weed) Soybean (Glycine max) U.S.A. (mid S)
Amaranthus palmeri (weed) Soybean (Glycine max) U.S.A. (NE)
Amaranthus palmeri (weed) Soybean (Glycine max) U.S.A. (SE)
Amaranthus tuberculatus (weed) Soybean (Glycine max) U.S.A. (mid N)