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The Dissipation of Tebuconazole and Propiconazole in Boronia (Boronia megastigma Nees)

journal contribution
posted on 2023-05-16, 14:54 authored by Sandra GarlandSandra Garland, Noel DaviesNoel Davies, Robert MenaryRobert Menary
The broad spectrum, systemic fungicides tebuconazole and propiconazole are used to control rust in boronia (Boronia megastigma Nees). Gas chromatography combined with either a benchtop quadrupole mass spectrometer or a high-resolution mass spectrometer allowed for the monitoring of both pesticides in boronia leaves, flowers, and concrete. Field trials were established at two sites to determine the rate of dissipation of tebuconazole and propiconazole in boronia. At site 1, two application rates of 125 and 250 g active ingredient/hectare (ai/ha) tebuconazole were employed. Treatments were repeated 17 days later. At harvest, 286 days after the final application, tebuconazole was detected at levels of 0.06 ± 0.05 and 0.5 ± 0.1 [mg/kg ± standard error, on a dry matter basis (DMB)] in the leaves collected from plots treated with 125 and 250 g ai/ha of tebuconazole, respectively. The oil produced from the flowers collected at the final harvest had residues of tebuconazole at levels of 0.06 ± 0.03 and 0.10 ± 0.08 mg/kg for the 125 and 250 g ai/ha application rates, respectively. Two repeat applications of 125 g ai/ha propiconazole were also used at site 1. Residues of propiconazole were detected at 0.09 ± 0.03 mg/kg (DMB) 286 days after the final application. At site 2, treatments of 125 g ai/ha of tebuconazole were applied twice. At harvest, 279 days after the final application of tebuconazole, residues were recorded at 0.30 ± 0.09 mg/kg in the leaves (DMB) while the oil produced had 0.20 ± 0.07 mg/kg.

History

Publication title

Journal of Agricultural and Food Chemistry

Volume

52

Issue

20

Pagination

6200-6204

ISSN

0021-8561

Department/School

Tasmanian Institute of Agriculture (TIA)

Publisher

Amer Chemical Soc

Place of publication

1155 16Th St, Nw, Washington, USA, Dc, 20036

Repository Status

  • Restricted

Socio-economic Objectives

Horticultural crops not elsewhere classified

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