Palmer amaranth control, fecundity, and seed viability from soybean herbicides applied at first female inflorescence

Abstract Palmer amaranth is an extremely troublesome weed for soybean growers because of its aggressive growth, adaptability, prolific seed production, and widespread resistance to many herbicides. Studies were initiated to determine the effects of herbicide application at first female inflorescence on Palmer amaranth control, biomass, seed production, cumulative germination, and seed viability. Enlist (2,4-D–resistant) soybean and Xtend (dicamba-resistant) soybean were planted and various combinations of either 2,4-D or dicamba with and without glufosinate and/or glyphosate were applied at first visible female Palmer amaranth inflorescence. Mixtures of 2,4-D + glufosinate and 2,4-D + glufosinate + glyphosate provided the greatest control at 4 wk after treatment in Enlist soybean. Similarly, in Xtend soybean, combinations of dicamba + glufosinate and dicamba + glufosinate + glyphosate provided the greatest control. The greatest reductions in biomass were from combinations of auxin herbicides (2,4-D or dicamba) plus glufosinate with and without glyphosate. Seed production was reduced most by treatments containing at least one effective site of action: an auxin herbicide (2,4-D or dicamba) or glufosinate. In contrast to previous research, cumulative germination and seed viability were not affected by herbicide treatments. This research indicates the efficacy of auxin herbicides or glufosinate alone and in combination to reduce the seed production of Palmer amaranth when applied at first female inflorescence. More research is needed to evaluate the full potential for applications of these herbicides at flower initiation to mitigate the evolution of herbicide resistance. Nomenclature: 2,4-D, dicamba; glufosinate; glyphosate; Palmer amaranth; Amaranthus palmeri S. Watson AMAPA; soybean Glycine max (L.) Merr.

[1]  Vipan Kumar,et al.  Confirmation of 2,4-D resistance and identification of multiple resistance in a Kansas Palmer amaranth (Amaranthus palmeri) population. , 2019, Pest management science.

[2]  Vijay K. Varanasi,et al.  Confirmation of S-metolachlor resistance in Palmer amaranth (Amaranthus palmeri) , 2019, Weed Technology.

[3]  J. Norsworthy,et al.  Field evaluation of preemergence and postemergence herbicides for control of protoporphyrinogen oxidase-resistant Palmer amaranth (Amaranthus palmeri S. Watson) , 2019, Weed Technology.

[4]  Hunter B. Blake.  Avoiding Protoporphyrinogen Oxidase Inhibiting Herbicide Selection Pressure on Common Ragweed and Palmer amaranth in Soybean , 2019 .

[5]  J. Bond,et al.  Evaluation of 2,4-D–based Herbicide Mixtures for Control of Glyphosate-Resistant Palmer Amaranth (Amaranthus palmeri) , 2018, Weed technology.

[6]  Eric L. Patterson,et al.  Reversing resistance to tembotrione in an Amaranthus tuberculatus (var. rudis) population from Nebraska, USA with cytochrome P450 inhibitors. , 2018, Pest management science.

[7]  A. C. York,et al.  Glufosinate Plus Dicamba for Rescue Palmer Amaranth Control in XtendFlexTM Cotton , 2017, Weed Technology.

[8]  J. Norsworthy,et al.  Seed Retention of Palmer amaranth (Amaranthus palmeri ) and Barnyardgrass (Echinochloa crus-galli ) in Soybean , 2017, Weed Technology.

[9]  Marie-Josée Simard,et al.  Managing glyphosate-resistant common ragweed (Ambrosia artemisiifolia): effect of glyphosate-phenoxy tank mixes on growth, fecundity, and seed viability , 2016, Weed Science.

[10]  R. Nichols,et al.  Resistance to PPO‐inhibiting herbicide in Palmer amaranth from Arkansas , 2016, Pest management science.

[11]  G. Kruger,et al.  Tall Waterhemp (Amaranthus tuberculatus) and Palmer amaranth (Amaranthus palmeri) Seed Production and Retention at Soybean Maturity , 2016, Weed Technology.

[12]  K. Renner,et al.  Late-Season Weed Management to Stop Viable Weed Seed Production , 2016, Weed Science.

[13]  A. Culpepper,et al.  Palmer Amaranth (Amaranthus palmeri) Management in Dicamba-Resistant Cotton , 2015, Weed Technology.

[14]  G. Kruger,et al.  Confirmation and Control of Triazine and 4-Hydroxyphenylpyruvate Dioxygenase-Inhibiting Herbicide-Resistant Palmer Amaranth (Amaranthus palmeri) in Nebraska , 2014, Weed Technology.

[15]  J. Norsworthy,et al.  Assessment of Weed Management Practices and Problem Weeds in the Midsouth United States—Soybean: A Consultant's Perspective , 2013, Weed Technology.

[16]  S. Ward,et al.  Palmer Amaranth (Amaranthus palmeri): A Review , 2013, Weed Technology.

[17]  A. Culpepper,et al.  WEED SCIENCE Weed Response to 2,4-D, 2,4-DB, and Dicamba Applied Alone or with Glufosinate , 2013 .

[18]  P. Jha,et al.  Influence of Late-Season Herbicide Applications on Control, Fecundity, and Progeny Fitness of Glyphosate-Resistant Palmer Amaranth (Amaranthus palmeri) Biotypes from Arkansas , 2012, Weed Technology.

[19]  Robert L. Nichols,et al.  Changes in the Prevalence of Weed Species in the Major Agronomic Crops of the Southern United States: 1994/1995 to 2008/2009 , 2012, Weed Science.

[20]  E. Webster,et al.  On the Analysis of Combined Experiments , 2011, Weed Technology.

[21]  P. Jha,et al.  Annual Changes in Temperature and Light Requirements for Germination of Palmer Amaranth (Amaranthus palmeri) Seeds Retrieved from Soil , 2010 .

[22]  S. Powles,et al.  Impact of crop-topping and swathing on the viable seed production of wild radish (Raphanus raphanistrum) , 2009 .

[23]  L. R. Oliver,et al.  Weed Seed Production as Influenced by Glyphosate Applications at Flowering Across a Weed Complex , 2008, Weed Technology.

[24]  L. R. Oliver,et al.  Reducing Weed Seed Rain with Late-Season Glyphosate Applications , 2007, Weed Technology.

[25]  M. Liebman,et al.  Comparing Estimates of Seed Viability in Three Foxtail (Setaria) Species Using the Imbibed Seed Crush Test with and Without Additional Tetrazolium Testing , 2007, Weed Technology.

[26]  Jerry W. Davis,et al.  Glyphosate-resistant Palmer amaranth (Amaranthus palmeri ) confirmed in Georgia , 2006, Weed Science.

[27]  L. Wax,et al.  Temperature effects on germination of nine Amaranthus species , 2004, Weed Science.

[28]  M. Horak,et al.  Interference of redroot pigweed (Amaranthus retroflexus), Palmer amaranth (A. palmeri), and common waterhemp (A. rudis) in soybean , 2003, Weed Science.

[29]  D. Skinner,et al.  Interspecific hybridization and gene flow of ALS resistance in Amaranthus species , 2001, Weed Science.

[30]  D. Shaw,et al.  Effect of Preharvest Desiccants on Weed Seed Production and Viability1 , 2000, Weed Technology.

[31]  D. D. Buhler,et al.  Andersen's Guide to Practical Methods of Propagating Weeds & Other Plants , 1999 .

[32]  I. Heap.  International survey of herbicide-resistant weeds , 1997 .

[33]  M. Horak,et al.  Biotypes of Palmer Amaranth (Amaranthus palmeri) and Common Waterhemp (Amaranthus rudis) are Resistant to Imazethapyr and Thifensulfuron , 1995, Weed Technology.

[34]  L. R. Oliver,et al.  Palmer Amaranth (Amaranthus palmeri) Interference in Soybeans (Glycine max) , 1994, Weed Science.

[35]  J. Toler,et al.  Resistance of Palmer Amaranth (Amaranthus palmeri) to the Dinitroaniline Herbicides , 1992, Weed Technology.

[36]  S. G. Carmer,et al.  Least significant differences for combined analyses of experiments with two- or three-factor treatment designs , 1989 .

[37]  P. E. Keeley,et al.  Influence of Planting Date on Growth of Palmer Amaranth (Amaranthus palmeri) , 1987, Weed Science.

[38]  A. W. Cole,et al.  Cowpea (Vigna unguiculata) Seed Protein Response to Glyphosate , 1985, Weed Science.

[39]  D. Geiger,et al.  Uptake and distribution of N-phosphonomethylglycine in sugar beet plants. , 1981, Plant physiology.

[40]  F. Chang,et al.  Dicamba Uptake, Translocation, Metabolism, and Selectivity , 1971, Weed Science.