Comparative persistence of thiacloprid in Bt-transgenic cabbage (Brassica oleracea cv. capitata) vis-à-vis non-transgenic crop and its decontamination.
Thiacloprid is a systemic neonicotinoid. The study hypothesized that difference may be seen in the rate of dissipation of thiacloprid when applied on non-transgenic and transgenic cabbage. Thiacloprid was estimated by HPLC. Half life of thiacloprid in transgenic as well as in normal cabbage ranged between 12.3-13.1 days in two doses of application. Under field condition, after 15 days, 59.2% and 54.3% dissipation was recorded at lower and higher rates of application in transgenic cabbage, where as the insecticide dissipated 57.5% and 59.1% for single dose and double dose application, respectively in non-transgenic cabbage. The study establishes that there is no significant difference in dissipation of a systemic pesticide in transgenic versus non-transgenic cabbage. Decontamination of thiacloprid contaminated cabbage was carried out by different chemical treatments. The application of 0.5% NaHCO(3) (an edible alkali) may be recommended for decontamination. Thiacloprid residues in the day-3 field samples of cabbage could be reduced below Japanese MRL (1.0 mg kg(-1)) by treating with 0.5% NaHCO(3) solution for 1 h.
Division of Agricultural Chemicals, Indian Agricultural Research Institute, New Delhi 110012, India.
Debashis
D
Dutta
Ram
R
Niwas
Madhuban
M
Gopal
D000083722:Bacillus thuringiensis Toxins; D001426:Bacterial Proteins / Q000235:genetics; D001937:Brassica / Q000737:chemistry* / Q000235:genetics / Q000378:metabolism; D004731:Endotoxins / Q000235:genetics; D006460:Hemolysin Proteins / Q000235:genetics; D007306:Insecticides / Q000032:analysis* / Q000378:metabolism; D007700:Kinetics; D000073943:Neonicotinoids; D030821:Plants, Genetically Modified / Q000737:chemistry* / Q000378:metabolism; D011725:Pyridines / Q000032:analysis* / Q000378:metabolism; D013843:Thiazines / Q000032:analysis* / Q000378:metabolism
D000083722:Bacillus thuringiensis Toxins; D001426:Bacterial Proteins; D004731:Endotoxins; D006460:Hemolysin Proteins; D007306:Insecticides; D000073943:Neonicotinoids; D011725:Pyridines; D013843:Thiazines; C030956:insecticidal crystal protein, Bacillus Thuringiensis; C417209:thiacloprid