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Dissipation of Propiconazole and Tebuconazole in Peppermint Crops (Mentha piperita (Labiatae)) and their Residues in Distilled Oils


Garland, SM and Menary, RC and Davies, NW, Dissipation of Propiconazole and Tebuconazole in Peppermint Crops (Mentha piperita (Labiatae)) and their Residues in Distilled Oils, Journal of Agricultural and Food Chemistry, 47, (1) pp. 294-298. ISSN 0021-8561 (1999) [Refereed Article]

DOI: doi:10.1021/jf980120e


The 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.

Item Details

Item Type:Refereed Article
Research Division:Agricultural, Veterinary and Food Sciences
Research Group:Horticultural production
Research Field:Horticultural production not elsewhere classified
Objective Division:Plant Production and Plant Primary Products
Objective Group:Horticultural crops
Objective Field:Horticultural crops not elsewhere classified
UTAS Author:Garland, SM (Dr Sandra Garland)
UTAS Author:Menary, RC (Professor Robert Menary)
UTAS Author:Davies, NW (Associate Professor Noel Davies)
ID Code:13380
Year Published:1999
Web of Science® Times Cited:34
Deposited By:Agricultural Science
Deposited On:1999-08-01
Last Modified:2000-06-06

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