Use of the Premix of Atrazine, Bicyclopyrone, S-Metolachlor, and Mesotrione for Weed Control in Corn (Zea mays L.)

Herbicides used in corn production in Texas


  • James Texas A&M AgriLife Research
  • Scott Texas A&M AgriLife Extension
  • Matt Texas A&M AgriLife Extension
  • Paul Texas A&M AgriLife Extension
  • Jourdan Texas A&M AgriLife Extension



Amaranthus Palmeri S. Wats, Brachiaria Platyphylla [Griseb] Nash, Cucumis Melo L, Echinochloa Colona (L.) Link, Helianthus Annuus L, Urochloa Fasciculate (Sw.) R. Webster, Urochloa Texana Buckl, Annual Grasses, Broadleaf Weeds


Field studies were conducted under conventional tillage from 2014 through the 2018 growing seasons in central, south-central, and the Panhandle regions of Texas to determine corn tolerance and weed efficacy of the four-way premix of atrazine plus bicyclopyrone plus mesotrione plus S-metolachlor (hereafter referred to as ABMS).  No corn injury was noted at any location with any ABMS dose or application timing.  Preemergence (PRE) applications of ABMS at 2.41 kg ha-1 controlled Palmer amaranth (Amaranthus palmeri S. Wats.) 73 to 100% while smellmelon (Cucumis melo L.) control was 100%.  Annual sunflower (Helianthus annuus L.) control with ABMS at 2.41 kg ha-1 was 86% while a split application applied PRE followed by a postemergence (POST) application provided 99% control.  Texas millet (Urochloa texana Buckl.) control with ABMS applied PRE ranged from 12 to 35% while broadleaf signalgrass (Brachiaria platyphylla [Griseb.] Nash) control was 100%.  Browntop panicum [Urochloa fasciculate (Sw.) R. Webster] control with a PRE application of ABMS at 2.41 kg ai ha-1 was < 82% while jungle rice [Echinochloa colona (L.) Link] control was 98%.  Control of a kochia (Kochia scoparia L.) with PRE applications of ABMS at 2.41 kg ha-1 was 95% while the split rate of 1.2 kg ha-1 applied PRE and POST provided 99% control.  Corn yields were variable but in most instances all herbicide treatments improved yield over the untreated check.  Excellent control of broadleaf weeds was observed with ABMS; however, annual grass control can be variable, especially with large-seeded annual grasses such as Texas millet.


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How to Cite

Grichar, W. J., Nolte, S. A., Matocha, M. E., Baumann, P., & Bell, J. M. (2020). Use of the Premix of Atrazine, Bicyclopyrone, S-Metolachlor, and Mesotrione for Weed Control in Corn (Zea mays L.): Herbicides used in corn production in Texas. JOURNAL OF ADVANCES IN AGRICULTURE, 11, 55–70.