Dissipation and Residues of Myclobutanil in Tobacco and Soil Under Field Conditions |
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Authors: | Wang Xiuguo Li Yiqiang Xu Guangjun Sun Huiqing Xu JinLi Zheng Xiao Wang Fenglong |
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Affiliation: | (1) Tobacco Research Institute of Chinese Academy of Agricultural Sciences (CAAS), Qingdao, 266101, People’s Republic of China; |
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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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