title: Dissipation and residues of myclobutanil in tobacco and soil under field conditions.
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.
authors.affiliation: Tobacco Research Institute of Chinese Academy of Agricultural Sciences (CAAS), Qingdao, 266101, People's Republic of China.
authors.forename: Xiuguo
authors.initials: X
authors.lastname: Wang
authors.forename: Yiqiang
authors.initials: Y
authors.lastname: Li
authors.forename: Guangjun
authors.initials: G
authors.lastname: Xu
authors.forename: Huiqing
authors.initials: H
authors.lastname: Sun
authors.forename: JinLi
authors.initials: J
authors.lastname: Xu
authors.forename: Xiao
authors.initials: X
authors.lastname: Zheng
authors.forename: Fenglong
authors.initials: F
authors.lastname: Wang
mesh_terms: D002681:China; D004784:Environmental Monitoring; D005659:Fungicides, Industrial / Q000032:analysis*; D008956:Models, Chemical; D009570:Nitriles / Q000032:analysis*; D010573:Pesticide Residues / Q000032:analysis*; D012987:Soil / Q000737:chemistry; D012989:Soil Pollutants / Q000032:analysis*; D014026:Nicotiana / Q000737:chemistry*; D014230:Triazoles / Q000032:analysis*
chemical_list: D005659:Fungicides, Industrial; D009570:Nitriles; D010573:Pesticide Residues; D012987:Soil; D012989:Soil Pollutants; D014230:Triazoles; C446685:systhane