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Dissipation Kinetics of Spinosad on Cauliflower (Brassica oleracea var. botrytis. L.) Under Subtropical Conditions of Punjab, India

Abstract

Residues of spinosad were estimated in cauliflower curds using high performance liquid chromatography (HPLC) and confirmed by high performance thin layer chromatography (HPTLC). Following three application of spinosad (Success 2.5 SC) at 15 and 30 g a.i. ha−1, the average initial deposits of spinosad were observed to be 0.57 and 1.34 mg kg−1, respectively. These residues dissipated below the limit of quantification (LOQ) of 0.02 mg kg−1 after 10 days at both the dosages. The half-life values (T 1/2) of spinosad were worked out to be 1.20 and 1.58 days, respectively, at recommended and double the recommended dosages. Thus, a waiting period of 6 days is suggested for the safe consumption of spinosad treated cauliflower.

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Acknowledgments

Authors are thankful to the Head, Department of Entomology, PAU, Ludhiana for providing research facilities to carry out these studies.

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Correspondence to Kousik Mandal.

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Mandal, K., Jyot, G. & Singh, B. Dissipation Kinetics of Spinosad on Cauliflower (Brassica oleracea var. botrytis. L.) Under Subtropical Conditions of Punjab, India. Bull Environ Contam Toxicol 83, 808 (2009). https://doi.org/10.1007/s00128-009-9844-z

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Keywords

  • Spinosad
  • Residues
  • Dissipation
  • Waiting period