Dissipation of the Fungicide Tetraconazole from Field-Sprayed Sugar Beets

Abstract

The reduction of tetraconazole residue levels in field sugar beets (roots and foliage) was investigated, and the effectiveness of this new fungicide against the leaf spot disease of sugar beet was evaluated. The fungicide was used according to the recommended application procedures. Sugar beets received five applications of tetraconazole at rates of 0.05 and 0.10 kg of active ingredient/ha. A multiresidue method was adapted, and tetraconazole residues were determined with gas chromatography using a wide-bore column and an electron capture detector. Recovery of tetraconazole from sugar beet roots and leaves was found in the range of 86-111 and 78-103%, and the detection limits were estimated as 0.001 and 0.002 mg/kg, respectively. A relatively rapid dissipation rate of tetraconazole residues was found with a half-life of 5 days for either sugar beet roots or foliage.

Determination of Tetraconazole and Diniconazole Fungicide Residues in Tomatoes and Green Beans by Capillary Gas Chromatography

“…1) Tetraconazole and diniconazole are eŠective in controlling a broad spectrum of diseases such as powdery mildew, scab, brown rust, septoria and rhynchosporium. 2,3) Great eŠorts are exerted to develop sensitive methods with low limits of quantiˆcation to determine residual levels of pesticides. Among the various methods of analysis, chromatographic methods (HPLC and GC) have the advantage of sensitivity despite the higher cost of instrumentation and chemicals.…”

“…5) Several schemes have been provided for extraction of both fungicides from plant materials and for their clean-up from interfering impurities. Extracting solvents used for tetraconazole varied from ethylacetatecyclohexane, 6) dichloramethane, 7 10) acetonitrile, 11) acetone, 1) and toluene, 2) while for diniconazole acetone, 12 14) hexane, chloroform, 15) or ethyl acetate 16) were used. Other methods for extraction include matrix solid-phase dispersion, 17) and solid-phase extraction 18) for tetraconazole and stir bar sorptive extraction, 19) solid bonded-phase extraction, 20) and supercritical ‰uid extraction 21) for diniconazole.…”

Dissipation of the fungicide hexaconazole in oil palm plantation

“…Hexaconazole is the common name for (RS)-2-(2,4-dichlorophenyl)-1-(1H-1,2,4-triazol-1-yl)hexan-2-ol. It has systemic demethylation inhibitors (DMI) that act mainly on the vegetative stage of fungi, by blocking the mycelial growth either inside or on the surface of the host plant (Menkissoglu-Spiroudi et al 1998). In Malaysia, hexaconazole has been recently introduced to control white root disease pathogens on a variety of crops (Lam and Chiu 1993;Chia 1997).…”

Determination of triadimenol based on the quenching effect on resonance light scattering from the triadimenol–deoxyribonucleic acid–hydrochloric acid system

“…It is used for the control of powdery mildews in cereals, fruits, cucurbits, tomatoes, ornamentals and other crops. Triadimenol and its residue are commonly analysed by GLC for the determination of the compounds in different matrices such as vegetables, fruits and water [1][2][3][4][5]. Liquid chromatography has also been used [6][7][8][9].…”