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Differential Response to Glyphosate in Italian Ryegrass (Lolium multiflorum) Populations from Mississippi

Published online by Cambridge University Press:  20 January 2017

Vijay K. Nandula ,
Daniel H. Poston ,
Thomas W. Eubank ,
Clifford H. Koger  and
Krishna N. Reddy
Vijay K. Nandula*
Affiliation:
Delta Research and Extension Center, Mississippi State University, Stoneville, MS 38776
Daniel H. Poston
Affiliation:
Delta Research and Extension Center, Mississippi State University, Stoneville, MS 38776
Thomas W. Eubank
Affiliation:
Delta Research and Extension Center, Mississippi State University, Stoneville, MS 38776
Clifford H. Koger
Affiliation:
USDA-ARS Crop Genetics and Production Research Unit, Stoneville, MS 38776
Krishna N. Reddy
Affiliation:
USDA-ARS Southern Weed Science Research Unit, Stoneville, MS 38776
*
Corresponding author's E-mail: vknandula@yahoo.com
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Abstract

Two Italian ryegrass populations from Mississippi, Tribbett and Fratesi, were suspected to be tolerant to glyphosate. A third population from Mississippi, Elizabeth, known to be susceptible to glyphosate, was included for comparison. Plants were treated with the isopropylamine salt of glyphosate at 0, 0.11, 0.21, 0.42, 0.84, 1.68, 3.36, and 6.72 kg ae/ha. GR50 (herbicide dose required to cause a 50% reduction in plant growth) values for the Tribbett, Fratesi, and Elizabeth populations were 0.66, 0.66, and 0.22 kg/ha, respectively, indicating that the Tribbett and Fratesi populations were threefold more tolerant to glyphosate compared with the Elizabeth population. These three populations were also treated with diclofop at 0, 0.13, 0.25, 0.5, 0.75, 1, and 2 kg ai/ha. Diclofop GR50 values for the Tribbett, Fratesi, and Elizabeth populations were 0.25, 0.28, 0.21 kg/ha, respectively, indicating similar tolerance to diclofop in the three populations. Response of all three populations to clethodim rate (0, 0.02, 0.03, 0.05, 0.06, 0.08, 0.09, and 0.13 kg ai/ha) was measured. Clethodim GR50 values for the Tribbett, Fratesi, and Elizabeth populations at the small growth stages were 0.016, 0.023, 0.014 kg/ha, respectively, and at the large growth stage were 0.04, 0.034, 0.02 kg/ha, respectively.

Keywords

ClethodimdiclofopglyphosateItalian ryegrass, Lolium multiflorum Lam. LOLMUAlternative control optionsglyphosate resistanceherbicide resistanceresistance managementweed resistance
Type
Research
Information
Weed Technology , Volume 21 , Issue 2 , June 2007 , pp. 477 - 482
Copyright
Copyright © Weed Science Society of America 

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