Abstract
Thiamethoxam 75 SG has recently got registered for use against shoot borer and termites of sugarcane. It is the only neonicotinoid having label claim against both the major pests of sugarcane. The dissipation kinetics and environmental risk assessment of thiamethoxam 75 SG were studied in a typical tropical sugarcane crop ecosystem as detailed reports are lacking. Rapid and sensitive method adopted to determine the residues of thiamethoxam in the soil employing HPLC could provide more than 95.5% recoveries. The insecticide was observed to persist in the sandy clay loam soil for 60 days and reached below the detectable level of less than 0.01 mg/kg (LOQ = 0.01 mg/kg) on 75th day when applied @ 120 g a.i./ha. The half-life was worked out to be 16.50 days. At double the recommended dose (240 g a.i./ha), the insecticide persisted up to 75 days with the half-life of 16.91 days. The risk quotient values indicated medium to low level of risk to earthworms during the course of degradation of thiamethoxam in the soil.
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Acknowledgements
The authors are grateful to Dr. Bakshi Ram, Director, ICAR-Sugarcane Breeding Institute and Dr. R. Viswanathan, Head, Division of Crop Protection for their constant encouragement and support in carrying out this research work. The technical support rendered by Mrs. C. Yogambal, Technical Assistant (Entomology) in imposing treatments, sampling and sample preparation deserves appreciation.
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Ramasubramanian, T., Paramasivam, M. Dissipation Kinetics and Environmental Risk Assessment of Thiamethoxam in the Sandy Clay Loam Soil of Tropical Sugarcane Crop Ecosystem. Bull Environ Contam Toxicol 105, 474–480 (2020). https://doi.org/10.1007/s00128-020-02951-5
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DOI: https://doi.org/10.1007/s00128-020-02951-5