Document Detail

Risk assessment of thiacloprid and its chemical decontamination on eggplant, Solanum melongena L.
MedLine Citation:
PMID:  19089852     Owner:  NLM     Status:  MEDLINE    
BACKGROUND: Thiacloprid [(Z)-3-(6-chloro-3-pyridylmethyl)-1,3-thiazolidin-2-ylidenecyanamide; Calypso] is a systemic insecticide having persistence in the plant system. It was chosen for the management of the eggplant shoot and fruit borer, Leucinodes orbonalis Guen. Management of this insect pest is difficult because it harbours inside the shoot and fruit portions of eggplant. The persistence of thiacloprid on eggplant has not been studied in India. The Food and Agriculture Organisation (FAO) has proposed its maximum residue limit (MRL) on eggplant as 0.7 mg kg(-1), and there is a need to validate this value. Since residues were found to be above this level, five different decontamination agents were tested for the decontamination of thiacloprid from eggplant. RESULTS: The half-life of thiacloprid was 11.1 and 11.6 days from trials in 2 years. Safety factors such as theoretical maximum daily intake (TMDI) and maximum permissible intake (MPI) were used to arrive at a risk assessment to human health from the analytical data obtained from the field trials. Thiacloprid at the doses tested (30 and 60 g AI ha(-1)) was not effective in managing eggplant fruit borer. A waiting period of 3 days before harvest of the fruits after insecticide application and a processing factor (PF) could not ensure a sufficient margin of safety (MOS). Subjecting the data to a processing factor of 60% could not bring the residues below the proposed MRL. CONCLUSION: Thiacloprid is not found to be an appropriate and effective agent for application to eggplant. Either the proposed MRL needs to be revised or good agricultural practice involving thiacloprid for plant protection in eggplant cultivation is required.
Jayakrishnan Saimandir; Madhuban Gopal; Suresh Walia
Publication Detail:
Type:  Journal Article    
Journal Detail:
Title:  Pest management science     Volume:  65     ISSN:  1526-498X     ISO Abbreviation:  Pest Manag. Sci.     Publication Date:  2009 Feb 
Date Detail:
Created Date:  2009-01-12     Completed Date:  2009-03-23     Revised Date:  2010-03-23    
Medline Journal Info:
Nlm Unique ID:  100898744     Medline TA:  Pest Manag Sci     Country:  England    
Other Details:
Languages:  eng     Pagination:  210-5     Citation Subset:  IM    
Division of Agricultural Chemicals, Indian Agricultural Research Institute, New Delhi 110012, India.
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MeSH Terms
Insecticides / pharmacology
Insects / drug effects
Pesticide Residues / chemistry*
Pyridines / chemistry*,  pharmacology
Solanum melongena / chemistry*
Thiazines / chemistry*,  pharmacology
Reg. No./Substance:
0/Insecticides; 0/Pesticide Residues; 0/Pyridines; 0/Thiazines; 0/thiacloprid

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