Author(s): S. Mukherjee, A. Goon, B. Ghosh, A. Kundu, K. Chakrabarti, S. Roy and A. Bhattacharyya

Abstract: The persistence behaviour of Florasulam and halauxifen-methyl were investigated at BCKV Experimental Farm, Mohanpur, West Bengal during two consecutive season of 2012-13 and 2013-14. Extraction of the herbicides was performed with acetonitrile followed by d-SEP clean up with PSA, GCB (for plant sample) and florisil. The residue of florasulam and halauxifen-methyl were quantified by Liquid Chromatography-mass Spectrometry using multiple reactions monitoring (MRM). The half-life of florasulam was found in the range of 1.1-1.4 days and 2.1-2.5 days for wheat plant and soil respectively. The half-life of haluxifen methyl was in the range of 1.0-1.2 days for wheat plant and 1.8-2.1 days for soil. No residue of florasulam and haluxifen-methyl was detected in harvest samples of wheat grain, straw and soil. It seems from this study that, application of the mixed formulation will not pose any residual toxicity problem when applied at recommended dose...

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