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  • Title: Persistence of thiacloprid residues on brinjal (Solanum melongena L.).
    Author: Sahoo SK, Mandal K, Kaur R, Battu RS, Singh B.
    Journal: Environ Monit Assess; 2013 Sep; 185(9):7935-43. PubMed ID: 23456274.
    Abstract:
    Thiacloprid, a neonicotinoid insecticide with novel mode of action, is found to be effective against several lepidopteran as well as hemipteran pests. The present studies were carried out to observe the persistence pattern of thiacloprid on brinjal and to suggest suitable waiting period for the safety of consumers. Persistence of thiacloprid in brinjal was studied following three applications of thiacloprid (Alanto 240 SC) at 180 and 360 g a.i. ha(-1) at 7 days interval. Residues of thiacloprid in brinjal were estimated by high-performance liquid chromatography and were confirmed by liquid chromatography-mass spectrometry. The average initial deposits of thiacloprid were observed to be 0.48 and 1.05 mg kg(-1) on the brinjal fruit following third application of thiacloprid at recommended and double the recommended dosages, respectively. Half-life periods for thiacloprid were found to be 0.47 and 0.50 days at single and double the application rates, respectively. Residues of thiacloprid declined below its limit of quantification of 0.05 mg kg(-1) after 3 and 5 days, respectively, at recommended and double the recommended application rates. Therefore, the use of thiacloprid does not seem to pose any risk hazard and a waiting period of 1 day is suggested for safe consumption of brinjal fruits.
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