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Response of Four Rice (Oryza sativa) Cultivars to Triclopyr

Published online by Cambridge University Press:  12 June 2017

David L. Jordan ,
Dearl E. Sanders ,
Steven D. Linscombe  and
Bill J. Williams
David L. Jordan
Affiliation:
Northeast Research Station, Louisiana State University Agricultural Center, P.O. Box 438, St. Joseph, LA 71366
Dearl E. Sanders
Affiliation:
Louisiana Cooperative Extension Service, 261 Knapp Hall, Louisiana State University Agricultural Center, Baton Rouge, LA 70803
Steven D. Linscombe
Affiliation:
Rice Research Station, P.O. Box 1429, Crowley, LA 70527
Bill J. Williams
Affiliation:
Northeast Research Station, Louisiana State University Agricultural Center, St. Joseph, LA
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Abstract

Experiments were conducted from 1994 through 1996 to determine the response of the rice cultivars ‘Bengal,’ ‘Cypress,’ ‘Jodon,’ and ‘Kaybonnet’ to triclopyr at 0.42 (standard rate) and 0.84 kg ai/ha applied postemergence at the four-leaf and panicle initiation stages of growth. Applications at the four-leaf stage were made in close association with fertilization and flood establishment, which often increases the potential for triclopyr to injure rice. Visible injury from triclopyr was slightly higher for the cultivar Jodon than for the cultivars Bengal, Cypress, or Kaybonnet. Injury was 3% or less when triclopyr at 0.42 kg/ha was applied at panicle initiation regardless of the cultivar. Triclopyr at 0.42 and 0.84 kg/ha applied at the four-leaf growth stage injured rice 7% and 22%, respectively. Triclopyr at 0.84 kg/ha applied at the four-leaf stage of growth delayed days from seedling emergence to seed head emergence and rice grain yield, irrespective of cultivar.

Keywords

Triclopyr, [(3,5,6-trichloro-2-pyridinyl)oxy]acetic acidrice, Oryza sativa L. ‘Bengal,’ ‘Cypress,’ ‘Jodon,’ ‘Kaybonnet.'Crop injuryherbicide tolerance
Type
Research
Information
Weed Technology , Volume 12 , Issue 2 , June 1998 , pp. 254 - 257
Copyright
Copyright © 1998 by the Weed Science Society of America 

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