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Dissipation of Triazole Fungicides in Apples
Tereza Horska1, Jitka Stara1, Frantisek Kocourek1
1Czech Agrifood Research Center, Drnovska 507/73, 161 06 Prague, Czech Republic.
Foods (Basel, Switzerland)
|September 27, 2025
Summary
This study tracked triazole fungicide dissipation in apples over four years. Residues decreased significantly before harvest, and storage did not lead to concerning levels, ensuring apple safety.
Area of Science:
- Agricultural Science
- Environmental Chemistry
- Food Safety
Background:
- Triazole fungicides are crucial for managing apple scab and powdery mildew.
- Understanding their dissipation is vital for ensuring fruit safety and compliance with regulations.
Purpose of the Study:
- To investigate the dissipation kinetics of six triazole fungicides in two apple cultivars.
- To assess pesticide residue levels after harvest and during cold storage.
- To evaluate the associated dietary risks for consumers.
Main Methods:
- Field study over four years on 'Rosana' and 'Selena' apple cultivars.
- Analysis of pesticide residues using QuEChERS extraction and liquid chromatography-mass spectrometry.
- Dissipation studies during cold storage over two years.
Main Results:
- Triazoles applied earlier (84-100 days pre-harvest) dissipated faster than those applied later (44-55 days pre-harvest).
- Most triazole residues were below 30% of maximum residue levels at harvest, except for tebuconazole.
- Difenoconazole, myclobutanil, and tebuconazole residues persisted above 0.01 mg/kg after five months of cold storage.
Conclusions:
- Triazole fungicide dissipation is influenced by application timing.
- While some residues persist in storage, calculated intake values remain below safety thresholds.
- Consumption of treated apples poses no significant acute or chronic health risks.
