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Dissipation of Propiconazole and Tebuconazole in Peppermint Crops (Mentha piperita (Labiatae)) and their Residues in Distilled Oils
journal contribution
posted on 2023-05-16, 11:05 authored by Sandra GarlandSandra Garland, Robert MenaryRobert Menary, Noel DaviesNoel DaviesThe broad-spectrum, systemic fungicides propiconazole (1) and tebuconazole (2) are used to control rust in peppermint (Mentha piperita L.). An analytical method, using gas chromatography combined with detection by high-resolution mass spectrometry, was developed to allow for the simultaneous monitoring of both pesticides in peppermint leaves and oil. Field trials were established to determine the rate of dissipation of tebuconazole and propiconazole in peppermint crops. Three applications of each fungicide were trialed at two rates (125 and 250 g of active ingredient (ai)/ha). At harvest, 64 days after the final application, propiconazole was detected at levels of 0.06 mg/kg and 0.09 mg/kg of dry weight, and tebuconazole was detected at 0.26 and 0.80 mg/kg dry weight, in identical trials. Rates of dissipation of propiconazole and tebuconazole were lower at a second trial site, where three applications of 125 g/ha ai for each fungicide resulted in residue levels of 0.21 mg/kg for both pesticides, detected 89 days after the last application. Propiconazole and tebuconazole were detected in the distilled oil at levels between 0.02 and 0.05 mg/kg and between 0.011 and 0.041 mg/kg, respectively. Propiconazole had a higher tendency to co-distill with the peppermint oil, with 0.7% of that present in the vegetative material ending up in the oil, compared to 0.09% of tebuconazole.
History
Publication title
Journal of Agricultural and Food ChemistryVolume
47Pagination
294-298ISSN
0021-8561Department/School
Tasmanian Institute of Agriculture (TIA)Publisher
The American Chemical SocietyPlace of publication
Washington, DC USARepository Status
- Restricted