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Dissipation and Residues of Myclobutanil in Tobacco and Soil Under Field Conditions

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Abstract

Field experiments were conducted in two different locations to determine the dissipation pattern and residue levels of myclobutanil in tobacco leaves and soil. Myclobutanil 12.5 % microemulsion (ME) formulation was sprayed once at 3.0 mL/ha, and the residues in green tobacco leaves dissipated to more than 50 % of the initial deposits 5 days after application and up to above 90 % after 21 days. The dissipation rate of myclobutanil in soil was lower than that in green tobacco leaves. The residues dissipated above 50 % of the initial deposits 7 days after treatment and dissipated about 90 % after 42 days. The calculated half-life values (T 1/2) were found to be 4.89–6.77 days in green tobacco leaves and 12.88–19.20 days in soil, respectively. The ultimate residues of myclobutanil in flue-cured tobacco leaves and soil were determined after the third and fourth applications at levels of 2.0 and 3.0 mL/ha. Myclobutanil residues in cured tobacco leaves 21 days after the last treatment ranged from 0.85 to 3.27 mg/kg. Meanwhile, the residues detected in soil reached below 0.045 mg/kg 21 days after the last treatment.

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Acknowledgments

This work was supported by the Open Project Program of Key Laboratory of Tobacco Pest Monitoring Controlling & Integrated Management, State Tobacco Monopoly Bureau (No. BC 201008).

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Correspondence to Yiqiang Li.

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Wang, X., Li, Y., Xu, G. et al. Dissipation and Residues of Myclobutanil in Tobacco and Soil Under Field Conditions. Bull Environ Contam Toxicol 88, 759–763 (2012). https://doi.org/10.1007/s00128-012-0596-9

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  • DOI: https://doi.org/10.1007/s00128-012-0596-9

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