Investigation of dissipation kinetics, safety evaluation and pre-harvest interval of some fungicides used in green-house cucumber and tomato

Articles in Press

Document Type : Research Paper

Authors

1 Pesticide Research Department, Iranian Research Institute of Plant Protection (IRIPP),, Agricultural Research, Education and Extension Organization (AREEO), Tehran, Iran.

2 Department of Plant Diseases Research, Iranian Research Institute of Plant Protection, Agricultural Research, Education and Extension Organization (AREEO)

3 Department of Physical Chemistry, Razi Vaccine and Serum Research Institute, Agricultural Research, Education and Extension Organization (AREEO), Tehran

4 Department of Pesticides Research, Iranian Research Institute of Plant Protection, Agricultural Research, Education and Extension Organization (AREEO)

5 Qazvin Agricultural and Natural Resources Research and Education Center, Agricultural Research, Education and Extension Organization (AREEO)

10.22059/ijpps.2025.402094.1007091

Abstract

Today, there is an urgent need to investigate the rate of reduction and degradation of pesticides after application in fields and to assess the safe interval before harvest to ensure that pesticide residues in the crop are safe. In these studies, the kinetics of degradation and reduction of difenoconazole + fluxapyroxad as SC 7.5/5 (Dagonis®) used to control powdery mildew of tomatoes, as well as the fungicides dimethomorph + cymoxanil as WG 70% (Pylarexanil®) used to control internal powdery mildew of cucumbers, were investigated. The pre-harvest interval (PHI) of these pesticides in cucumber and tomato crops was estimated to be 3 days, which was investigated by examining the kinetics of their degradation and reduction in greenhouse cucumber and tomato crops at optimum and maximum doses. Monitoring of residual amounts was carried out immediately after spraying for 11 days after that, with 3 repetitions. The residual amounts were evaluated according to the national MRLs of these fungicides, and for all of them, the residues were less than the national MRL at all sampling times. Therefore, the 3-day PHI for both Dagonis and pilarexanil fungicides are acceptable. First-order kinetic equations for difenoconazole + fluxapyroxad and dimethomorph + cymoxanil also confirm the 3-day PHI.

Keywords

Iranian Journal of Plant Protection Science

Articles in Press, Accepted Manuscript
Available Online from 09 December 2025

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History

  • Receive Date: 17 September 2025
  • Revise Date: 06 December 2025
  • Accept Date: 09 December 2025

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