Pesticide Residue Laboratory, Indian Institute of Horticultural Research, Hessaraghatta Lake PO, Bangalore 560089, Karnataka, India.
Bull Environ Contam Toxicol. 2012 Oct;89(4):862-7. doi: 10.1007/s00128-012-0762-0. Epub 2012 Aug 8.
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.
螺虫乙酯是一种具有韧皮部和木质部双向传导性的独特杀虫剂，噻虫啉是世界上使用最广泛的新烟碱类杀虫剂之一。该复配制剂对芒果的刺吸式害虫非常有效。本研究采用田间试验的方法，研究了螺虫乙酯·噻虫啉（240 SC）12%·12%（90、180 g a.i. ha-1）在芒果和土壤中的残留动态。施药 3 次后，在芒果果实中的螺虫乙酯残留量分别为 0.327 和 0.483 mg kg-1；在芒果果实中的半衰期分别为 3.3 和 5.2 d。螺虫乙酯在芒果果实中的代谢物螺虫乙酯-烯醇未被检出。两种处理的芒果果实中初始噻虫啉残留量分别为 0.329 和 0.536 mg kg-1。噻虫啉在芒果果实中的半衰期分别为 5.2 和 8.2 d。在收获时，成熟芒果果实和田间土壤中的螺虫乙酯、螺虫乙酯-烯醇和噻虫啉残留量均低于 0.05 mg kg-1 的定量限。
