title: Residue dynamics of spirotetramat and imidacloprid in/on mango and soil.
abstract: Spirotetramat is a unique insecticide having both phloem and xylem mobility and imidacloprid, a neonicotinoid insecticide, is one of the most widely used in the world. The combination formulation is very effective against sucking pests of mango. Residue dynamics of spirotetramat and imidacloprid in/on mango and soil was studied following application of the combination formulation, spirotetramat 12% + imidacloprid 12% (240 SC) at 90 and 180 g a.i. ha(-1). Spirotetramat residues in/on mango fruits were 0.327 and 0.483 mg kg(-1) after giving 3 applications at 90 and 180 g a.i. ha(-1), respectively. The residues remained on mango fruits for 7 days and dissipated with the half-life of 3.3 and 5.2 days, respectively. Residues of spirotetramat-enol, the major metabolite of spirotetramat in plant, were not detected in mango fruits. Initial residues of imidacloprid on mango fruits from the two treatments were 0.329 and 0.536 mg kg(-1), respectively. Imidacloprid residues remained on mango fruits beyond 15 days and dissipated with the half-life of 5.2 and 8.2 days. The residues of spirotetramat, spirotetramat-enol and imidacloprid were found below quantifiable limit of 0.05 mg kg(-1) in mature mango fruits and field soil at harvest.
authors.affiliation: Pesticide Residue Laboratory, Indian Institute of Horticultural Research, Hessaraghatta Lake PO, Bangalore 560089, Karnataka, India. soudamini_mohapatra@rediffmail.com
authors.forename: Soudamini
authors.initials: S
authors.lastname: Mohapatra
authors.forename: M
authors.initials: M
authors.lastname: Deepa
authors.forename: S
authors.initials: S
authors.lastname: Lekha
authors.forename: B
authors.initials: B
authors.lastname: Nethravathi
authors.forename: B
authors.initials: B
authors.lastname: Radhika
authors.forename: S
authors.initials: S
authors.lastname: Gourishanker
mesh_terms: D001372:Aza Compounds / Q000032:analysis*; D004784:Environmental Monitoring; D007093:Imidazoles / Q000032:analysis*; D007306:Insecticides / Q000032:analysis*; D031022:Mangifera / Q000737:chemistry*; D000073943:Neonicotinoids; D009574:Nitro Compounds / Q000032:analysis*; D010573:Pesticide Residues / Q000032:analysis*; D012987:Soil / Q000737:chemistry; D012989:Soil Pollutants / Q000032:analysis*; D013141:Spiro Compounds / Q000032:analysis*
chemical_list: D001372:Aza Compounds; D007093:Imidazoles; D007306:Insecticides; D000073943:Neonicotinoids; D009574:Nitro Compounds; D010573:Pesticide Residues; D012987:Soil; D012989:Soil Pollutants; D013141:Spiro Compounds; C082359:imidacloprid; C570705:spirotetramat