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.

Hapten Design and Antibody Generation for Immunoanalysis of Spirotetramat and Spirotetramat-enol

“…On the other hand, the LOD values for the capture assay were almost 100 times higher for SP than for SP-enol (5 and 0.06 nM, respectively). These values are in the same range of those of the reference chromatographic methods, 10,17,18 and they suggest the great potential of the developed immunoassays for SP and SP-enol residue determination.…”

Chemometric-assisted QuEChERS extraction method for the residual analysis of thiacloprid, spirotetramat and spirotetramat’s four metabolites in pepper: Application of their dissipation patterns

“…The residue dynamics of thiacloprid have been studied in different matrices, including medicinal herbs, tomatoes, eggplants, cabbage and soil (Dong et al, 2014;Omirou, Vryzas, Papadopoulou-Mourkidou, & Economou, 2009;Saimandir, Gopal, & Walia, 2009;Wang, Guan, & Zhang, 2011;Yu, Wu, Stahler, & Pestemer, 2007). Only two published papers were available on the behaviour of spirotetramat in plants (i.e., cotton, mango and soil) (Mohapatra, Deepa, Lekha, et al, 2012;Pandiselvi, Sathiyanarayanan, & Ramesh, 2010). However, the four metabolites of spirotetramat were ignored in those dissipation studies.…”

A liquid chromatography with tandem mass spectrometry method to simultaneously determinate chlorpyrifos, imidacloprid and imidacloprid metabolites in wheat

“…Many analytical methods for imidacloprid or imidacloprid metabolites have been reported, such as HPLC and LC–MS/MS . For example, Sharma et al.…”

“…Many analytical methods for imidacloprid or imidacloprid metabolites have been reported, such as HPLC [15][16][17][18][19][20][21][22] and LC-MS/MS [23][24][25][26]. For example, Sharma et al and Akoijam et al analyzed the residues of imidacloprid and its metabolites in soil, sugarcane leaves, juice, and rice, and they studied the metabolism and persistence of imidacloprid in different types of soils under laboratory conditions by HPLC.…”