Dissipation pattern of flubendiamide residues on capsicum fruit (Capsicum annuum L.) under field and controlled environmental conditions |
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Authors: | Radhika Buddidathi Lekha Siddamallaiah Gourishankar Manikrao Shibara Shankara Hebbar |
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Institution: | 1. Pesticide Residue Laboratory, Indian Institute of Horticultural Research, Hessaraghatta Lake PO, Bengaluru, Karnataka, India;2. Center for Postgraduate Studies (Jain University), Jayanagar, Bengaluru, Karnataka, India;3. Division of Vegetable Crops, Indian Institute of Horticultural Research, Hessaraghatta Lake PO, Bengaluru, Karnataka, India |
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Abstract: | This investigation was undertaken to compare the dissipation pattern of flubendiamide in capsicum fruits under poly-house and open field after giving spray applications at the recommended and double doses of 48 g a.i. ha?1 and 96 g a.i. ha?1. Extraction and purification of capsicum fruit samples were carried out by the QuEChERS method. Residues of flubendiamide and its metabolite, des-iodo flubendiamide, were analyzed by high-performance liquid chromatography–photodiode array, and confirmed by liquid chromatography–mass spectrometry/mass spectrometry. Limit of quantification of the method was 0.05 mg kg?1, and recovery of the insecticides was in the range of 89.6–104.3%, with relative standard deviation being 4.5–11.5%. The measurement uncertainty of the analytical method was in the range of 10.7–15.7%. Initial residue deposits of flubendiamide on capsicum fruits grown under poly-house conditions were (0.977 and 1.834 mg kg?1) higher than that grown in the field (0.665 and 1.545 mg kg?1). Flubendiamide residues persisted for 15 days in field-grown and for 25 days in poly-house-grown capsicum fruits. The residues were degraded with the half-lives of 4.3–4.7 and 5.6–6.6 days in field and poly-house respectively. Des-iodo flubendiamide was not detected in capsicum fruits or soil. The residues of flubendiamide degraded to below the maximum residue limit notified by Codex Alimentarius Commission (FAO/WHO) after 1 and 6 days in open field, and 3 and 10 days in poly-house. The results of the study indicated that flubendiamide applied to capsicum under controlled environmental conditions required longer pre-harvest interval to allow its residues to dissipate to the safe level. |
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Keywords: | Capsicum flubendiamide half-life open field poly-house |
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