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Corn and Rice Response to Simulated Drift of Imazethapyr Plus Imazapyr

Published online by Cambridge University Press:  20 January 2017

Jason A. Bond ,
James L. Griffin ,
Jeffrey M. Ellis ,
Steven D. Linscombe  and
Bill J. Williams
Jason A. Bond*
Affiliation:
Department of Agronomy and Environmental Management, LSU AgCenter, 104 Sturgis Hall, Baton Rouge, LA 70803
James L. Griffin
Affiliation:
Department of Agronomy and Environmental Management, LSU AgCenter, 104 Sturgis Hall, Baton Rouge, LA 70803
Jeffrey M. Ellis
Affiliation:
Department of Agronomy and Environmental Management, LSU AgCenter, 104 Sturgis Hall, Baton Rouge, LA 70803
Steven D. Linscombe
Affiliation:
LSU AgCenter, Rice Research Station, 1373 Caffey Road, Rayne, LA 70578
Bill J. Williams
Affiliation:
LSU AgCenter, Northeast Research Station, Box 438, St. Joseph, LA 71366
*
Corresponding author's E-mail: [email protected]
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Abstract

Field research was conducted for 2 yr to evaluate response of corn and rice to simulated drift rates of a commercial premix of imazethapyr plus imazapyr [3:1 (w/w)]. Drift rates of the imazethapyr plus imazapyr premix represented 0.8, 1.6, 3.2, 6.3, and 12.5% of the usage rate of 63 g ai/ha (0.5, 1, 2, 4, and 7.9 g/ha, respectively). The imazethapyr plus imazapyr premix applied to six-leaf corn at 7.9 g/ha reduced height 11% compared with the nontreated control 7 days after treatment (DAT) but did not affect corn height 14 and 28 DAT. Corn yield was equivalent regardless of imazethapyr plus imazapyr rate and ranged from 10,200 to 11,500 kg/ha. At 28 DAT, rice height was reduced 12% when 7.9 g/ha of the imazethapyr plus imazapyr premix was applied early postemergence (EPOST) at two- to three-leaf and 14 and 5% when the imazethapyr plus imazapyr premix at 7.9 and 4 g/ha, respectively, was applied late postemergence (LPOST) at panicle differentiation. Reductions in mature rice height of 11 and 6% were observed when the imazethapyr plus imazapyr premix was applied LPOST at 7.9 and 4 g/ha, respectively, and a 5% reduction was observed for 7.9 g/ha of the imazethapyr plus imazapyr premix applied EPOST. Application of the imazethapyr plus imazapyr premix EPOST at 7.9 g/ha delayed heading in only 1 yr, but heading was delayed both years when applied LPOST. Rice yield was reduced 39 and 16% when the imazethapyr plus imazapyr premix was applied LPOST at 7.9 and 4 g/ha, respectively, compared with a 9% yield reduction for 7.9 g/ha applied EPOST.

Keywords

Imazapyrimazethapyrcorn, Zea mays L. ‘Dekalb 687’rice, Oryza sativa L. ‘Cypress’Crop injuryherbicide driftoff-target movementIRimidazolinone-resistant
Type
Research Article
Information
Weed Technology , Volume 20 , Issue 1 , March 2006 , pp. 113 - 117
Copyright
Copyright © Weed Science Society of America 

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