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Impact of Imazamox and Imazapyr Carryover on Wheat, Barley, and Oat

Published online by Cambridge University Press:  01 December 2017

Julio A. Scursoni ,
Jorgelina C. Montoya ,
Mario R. Vigna ,
Ramón Gigón ,
Carolina Istilart ,
Juan P. Renzi Pugni ,
Ricardo López  and
Carolina Porfiri
Julio A. Scursoni*
Affiliation:
Associate Professor, Plant Production Department, Facultad de Agronomía, Universidad de Buenos Aires, Avenida San Martín 4453 (1417), Buenos Aires, Argentina
Jorgelina C. Montoya
Affiliation:
Weed Researchers, EEA INTA Anguil, Ruta Nacional Nº 5 Km 580 (6326), Anguil, La Pampa, Argentina
Mario R. Vigna
Affiliation:
Weed Researchers, EEA INTA Bordenave, Ruta Provincial 76 Km 36.5 (8187), Bordenave, Provincia de Buenos Aires, Argentina
Ramón Gigón
Affiliation:
Weed Researchers, EEA INTA Barrow Ruta 3 Km 488 (7500), Tres Arroyos, Argentina
Carolina Istilart
Affiliation:
Weed Researchers, EEA INTA Barrow Ruta 3 Km 488 (7500), Tres Arroyos, Argentina
Juan P. Renzi Pugni
Affiliation:
Weed Researcher, EEA INTA Hilario Ascasubi-CERBAS, Ruta 3 Km 794 (8142), Hilario Ascasubi, Argentina
Ricardo López
Affiliation:
Weed Researchers, EEA INTA Bordenave, Ruta Provincial 76 Km 36.5 (8187), Bordenave, Provincia de Buenos Aires, Argentina
Carolina Porfiri
Affiliation:
Weed Researchers, EEA INTA Anguil, Ruta Nacional Nº 5 Km 580 (6326), Anguil, La Pampa, Argentina
*
*Corresponding author’s E-mail: [email protected]
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Abstract

Imazapyr and imazamox are frequently applied postemergence to control grass and broadleaf weeds in imidazolinone-resistant sunflower in Argentina. Herbicide carryover to rotational crops represents a disadvantage of these herbicides, particularly in regions with low rainfall during the months prior to rotational crop sowing. Between 2009 and 2012, field and greenhouse studies were conducted on four important sunflower-cropped areas of Argentina. The objective was to quantify the effects of imazapyr alone and imazamox plus imazapyr applied in sunflower crops on the subsequent establishment, growth, and yield of barley, oat, and wheat. In all field experiments, imazapyr alone and imazamox plus imazapyr were applied at recommended rates (80 gha–1 and 66 plus 30 gha–1, respectively), and also, in some experiments, at double the recommended rates. Soil bioassays were also conducted in the greenhouse to study the effect of these herbicides on barley, oat, and wheat seedlings. The mixture of imazamox plus imazapyr was safer for rotational crops than imazapyr applied alone, because of the reduced rate of imazapyr in the mixture treatments. Barley was more sensitive to imidazolinones, particularly imazapyr, than the other winter cereals. Imazapyr at double rate (160 gha–1) reduced barley yield by 45% when seeds were sown 165 d after herbicide application and with 240 mm rainfall after herbicide application.

Keywords

Imazamoximazapyrbarley, Hordeum vulgare L.oat, Avena sativa L.sunflower, Helianthus annuus L.wheat, Triticum aestivum L.Imidazolinone herbicidescarryover
Type
Weed Management-Major Crops
Information
Weed Technology , Volume 31 , Issue 6 , December 2017 , pp. 838 - 846
Copyright
© Weed Science Society of America, 2017 

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Footnotes

Associate Editor for this Paper: Andrew Kniss, University of Wyoming.

References

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