Abstract
This study evaluated the residue behavior of two insecticides, spinetoram and emamectin benzoate, in Chinese kale (Brassica oleracea var. alboglabra) under Good Agricultural Practice (GAP) conditions to support the establishment of Maximum Residue Limits (MRLs) and Pre-Harvest Intervals (PHIs) for national and international standards. Field trials were conducted in Kanchanaburi, Nakhon Pathom, and Suphanburi provinces in Thailand. Spinetoram (1.2% W/V SC) was applied twice at 60 mL per 20 L of water every 5 days. Samples collected at 0, 1, 3, 5, 7, 10, and 14 days after the final application (DALA) were analyzed by LC-MS/MS (LOQ 0.05 mg/kg). Residue levels declined from 6.0–15.0 mg/kg on day 0 to ≤0.19 mg/kg by day 14. No residues were detected in untreated controls. A PHI of 3 days was established, and an MRL of 10 mg/kg is proposed for spinetoram in Chinese kale. Emamectin benzoate (1.92% W/V EC) was applied twice at 20 mL per 20 L every 7 days. Samples collected at the same intervals were analyzed by LC-MS/MS (LOQ 0.005 mg/kg; LOD 0.002 mg/kg). Residues declined rapidly, falling below the LOQ from day 3 onward. A PHI of 3 days and an MRL of 0.3 mg/kg are proposed. These findings provide a scientific basis for setting Thai MRLs and support their adoption under ASEAN and Codex standards. The results further demonstrate the potential of spinetoram and emamectin benzoate as safe and effective options for Chinese kale production, enhancing compliance with international food safety requirements and supporting international trade.
Presenters
Chanita ThongsamProfessional Senior Scientist, Agricultural Production Science Research and Development Division, Department of Agriculture, Krung Thep Maha Nakhon [Bangkok], Thailand
Details
Presentation Type
Paper Presentation in a Themed Session
Theme
Food Production and Sustainability
KEYWORDS
Spinetoram, Emamectin Benzoate, MRL, PHI, Chinese Kale, Food Safety, Pesticide Residue, LC-MS/MS
