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Evaluation of S-Metolachlor and S-Metolachlor Plus Atrazine Mixtures with Mesotrione for Broadleaf Weed Control in Corn

Published online by Cambridge University Press:  20 January 2017

Cory M. Whaley ,
Gregory R. Armel ,
Henry P. Wilson  and
Thomas E. Hines
Cory M. Whaley
Affiliation:
Eastern Shore Agriculture Research and Extension Center, Virginia Polytechnic Institute and State University, Painter, VA 23420
Gregory R. Armel
Affiliation:
Eastern Shore Agriculture Research and Extension Center, Virginia Polytechnic Institute and State University, Painter, VA 23420
Henry P. Wilson*
Affiliation:
Eastern Shore Agriculture Research and Extension Center, Virginia Polytechnic Institute and State University, Painter, VA 23420
Thomas E. Hines
Affiliation:
Eastern Shore Agriculture Research and Extension Center, Virginia Polytechnic Institute and State University, Painter, VA 23420
*
Corresponding author's E-mail: [email protected].
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Abstract

Field experiments were conducted in 2001, 2002, and 2003 to evaluate PRE applications of mesotrione at 150, 230, and 310 g ai/ha alone, and in mixtures with S-metolachlor at 1,070 g ai/ha and atrazine at 560 and 1,120 g ai/ha in corn. Corn injury was 11 to 18% with all treatments in 2002 when 3.2 cm of rainfall occurred within 10 d after PRE applications, but no injury was observed in 2001 and 2003 when rainfall was 0 and 1.1 cm within 10 d after PRE applications, respectively. Rainfall following PRE herbicide applications also influenced weed control, where weed control was generally poor with all herbicide treatments in 2001. Mesotrione at 150 g/ha controlled common lambsquarters and smooth pigweed at least 95% in 2002 and 2003, but control was 70% or less in 2001. PRE mesotrione at rates of 230 or 310 g/ha controlled common ragweed at least 83% in 2002 and 2003, but control exceeded 88% with mixtures of mesotrione at rates greater than 150 g/ha plus S-metolachlor plus atrazine at 560 g/ha. Morningglory species (ivyleaf morningglory, pitted morningglory, and tall morningglory) were not consistently controlled by mesotrione alone. In 2002 and 2003, mixtures of all mesotrione rates plus S-metolachlor plus atrazine at 1,120 g/ha controlled morningglory species at least 90%. Corn treated with mesotrione at any rate plus S-metolachlor plus atrazine at 1,120 g/ha consistently produced high yields. It is concluded that control with this three-way mixture would be most consistent with a minimum rate of mesotrione at 230 g/ha and atrazine at 1,120 g/ha.

Keywords

AtrazinemesotrioneS-metolachlorcommon lambsquarters, Chenopodium album L. CHEALcommon ragweed, Ambrosia artemisiifolia L. AMBELivyleaf morningglory, Ipomoea hederacea (L.) Jacq. IPOHEmorningglory species, Ipomoea spp. IPOSSpitted morningglory, Ipomoea lacunosa L. IPOLAsmooth pigweed, Amaranthus hybridus L. AMACHtall morningglory, Ipomoea purpurea (L.) Roth PHBPUcorn, Zea mays L. ‘Dekalb DKC64-10 (RR2)’, ‘Pioneer 33B51’, ‘Pioneer 33G26’Chloroacetamide herbicidescrop yieldherbicide mixturesHPPD-inhibiting herbicidestriazine herbicidestriketone herbicides
Type
Weed Management—Major Crops
Information
Weed Technology , Volume 23 , Issue 2 , June 2009 , pp. 193 - 196
Copyright
Copyright © Weed Science Society of America 

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