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1 January 2009 Imidazolinone-Resistant Sunflower Tolerance to Imazapic
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Abstract

Field trials were conducted in Georgia in 2007 to 2008 to evaluate the tolerance of three imidazolinone-resistant sunflower cultivars to POST applications of imazapic. There was no interaction between sunflower cultivar and herbicide treatment. When averaged over sunflower cultivars, imazapic, at 70 and 140 g ai/ha and applied at 30 d after planting, had no effect on sunflower above-ground biomass, plant height, seed-heads per meter row, and seed-head weights. Sunflower response to imazapic was similar to that of imazamox. Imazapic could be used in imidazolinone-resistant sunflower production systems without risk of unacceptable crop injury.

Nomenclature: Imazamox; imazapic; sunflower, Helianthus annuus L. ‘Dekalb 3880CL’, ‘Mycogen 8H419CL’, and ‘Mycogen 8N386CL’

Eric P. Prostko, Timothy L. Grey, and Jerry W. Davis "Imidazolinone-Resistant Sunflower Tolerance to Imazapic," Weed Technology 23(1), 188-190, (1 January 2009). https://doi.org/10.1614/WT-08-114.1
Received: 11 August 2008; Accepted: 1 December 2008; Published: 1 January 2009
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