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Residue Dynamics of Tebuconazole and Quinalphos in Immature Onion Bulb with Leaves, Mature Onion Bulb and Soil

Abstract

Residue persistence of tebuconazole and quinalphos in immature onion bulb with leaves (spring onion), mature onion bulb and soil was studied following their spray applications 3 times. The applications were untreated control; tebuconazole @ 187.5 and 375 g a.i. ha−1; quinalphos @ 300 and 600 g a.i. ha−1. Initial residue deposits of tebuconazole in immature onion bulb with leaves from the two treatments were 0.628 and 1.228 mg kg−1. The residues of tebuconazole dissipated with the half-life of 5 and 7.7 days. The safe pre-harvest intervals (PHI) for consumption of immature onion bulb with leaves were 16 and 35 days, respectively. Initial residue deposits of quinalphos in immature onion bulb with leaves from the two treatments were 0.864 and 2.283 mg kg−1. Loss of quinalphos residues from immature onion bulb with leaves was very fast. The residues dissipated with the half-life of 1.7 and 2.6 days and the required PHI was 5 and 11 days, respectively. At harvest mature onion bulbs were free from residues of both tebuconazole and quinalphos.

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References

  1. Aktar MW, Sengupta D, Chowdhury A (2008) Degradation dynamics and persistence of quinolphos and methomyl in/on okra (Ablemoschus esculentus) fruits and cropped soil. Bull Environ Contam Toxicol 80:74–77

    Article  CAS  Google Scholar 

  2. Anonymous (2007) http://www.bayercropscience.com/bayer/cropscience/cscms.nsf/id/tebuconazole.htm Accessed March 2011

  3. Anonymous (2008) Joint meeting on pesticide residues: tebuconazole, pesticide residues in food. FAO plant production and protection paper. 189: 2033–2034

  4. Hoskins WM (1961) Mathematical treatment of loss of pesticide residues. Plant Prot Bull (FAO) 9:163–168

    Google Scholar 

  5. Jaime MDLA, Hovins MHY, McDonald MR (1999) Field evaluation of tebuconazole to control onion white rot. In: Fungicide and nematicide Tests. P 22

  6. Koike ST, Smith RF, Nunez JJ, Voss RE (2001) Characterization and control of garlic rust in California. Plant Dis 85:838–842

    Article  Google Scholar 

  7. Sameer GC, Muniswamy D (2010) Respiratory responses and behavioural anomalies of the carp Cyprinus carpio under quinalphos intoxication in sub lethal doses. Sci Asia 36:12–17

    Article  Google Scholar 

  8. Soares RM, Kurozowa KC (1998) Chemical control of associated fungi of garlic cloves. Summa-Phytopathologica 24:279–283

    CAS  Google Scholar 

  9. Wickramaarachchi WART, Athauda AATR, Dissanayaka DMK (2004) Evaluation of selected fungicides for controlling purple blotch disease of small onions. Annals Sri Lankan Dept Ag 6:237–244

    Google Scholar 

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Acknowledgments

The authors thank Director, IIHR, Bangalore and ICAR, New Delhi for providing the facilities for carrying out this study.

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Correspondence to Soudamini Mohapatra.

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Mohapatra, S., Deepa, M. & Jagdish, G.K. Residue Dynamics of Tebuconazole and Quinalphos in Immature Onion Bulb with Leaves, Mature Onion Bulb and Soil. Bull Environ Contam Toxicol 87, 703–707 (2011). https://doi.org/10.1007/s00128-011-0403-z

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Keywords

  • Half-life
  • Onion
  • Pre-harvest interval
  • Quinalphos
  • Tebuconazole