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Residue Dynamics of Fenamidone and Mancozeb on Gherkin Under Two Agro Climatic Zones in the State of Karnataka, India


Residue dynamics of fenamidone and mancozeb on gherkin was evaluated at two different agro climatic zones i.e. at Bangalore (Zone-1) and Dharwad (Zone-2) in the state of Karnataka, India. Two treatments of the combination formulation (fenamidone 10% + mancozeb 50%) were given at the standard dose 150 + 750 g a.i. ha−1 and double dose 300 + 1,500 g a.i. ha−1. Initial residue deposits of fenamidone were 0.467 and 0.474 mg kg−1 at Zone-1 and 2, respectively from standard dose treatment. From double dose treatment they were 0.964 and 0.856 mg kg−1, respectively. Fenamidone residues persisted for 15 and 10 days and dissipated with the half-life of 4 and 3 days at Zone-1 and 2, respectively. Mancozeb residue deposits on gherkin were 0.383 and 0.428 mg kg−1 from standard dose and 0.727 and 0.626 mg kg−1 from double dose treatment at Zone-1 and 2, respectively. Mancozeb residues dissipated with the half-life of 2 and 1 day, respectively. Residues of both fenamidone and mancozeb dissipated faster at Zone-2 compared to Zone-1. The limit of quantification of fenamidone and mancozeb were 0.02 and 0.1 mg kg−1, respectively in both gherkin and soil. Residues of fenamidone and mancozeb in soil collected on the 20th day from the 2 locations were found to be below quantifiable limit of both fungicides.

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

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Correspondence to Soudamini Mohapatra.

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Mohapatra, S., Deepa, M. Residue Dynamics of Fenamidone and Mancozeb on Gherkin Under Two Agro Climatic Zones in the State of Karnataka, India. Bull Environ Contam Toxicol 88, 507–510 (2012).

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  • Downy mildew
  • Fenamidone
  • Gherkin
  • Mancozeb
  • Residue