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Related Experiment Video

Updated: Jun 26, 2026

Study on the Metabolism of Six Systemic Insecticides in a Newly Established Cell Suspension Culture Derived from Tea (Camellia Sinensis L.) Leaves

Study on the Metabolism of Six Systemic Insecticides in a Newly Established Cell Suspension Culture Derived from Tea (Camellia Sinensis L.) Leaves

Published on: June 15, 2019

Residues of lambda-cyhalothrin in tea.

Subbiah Seenivasan¹, Narayanan Nair Muraleedharan

¹UPASI Tea Research Foundation, Tea Research Institute, Nirar Dam BPO, Valparai 642 127, India.

Food and Chemical Toxicology : an International Journal Published for the British Industrial Biological Research Association

|January 1, 2009

Summary

Lambda-cyhalothrin insecticide residues in tea dissipate quickly, reaching safe levels within 5 days. A 5-day safety harvest interval is recommended for tea treated with this insecticide.

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Area of Science:

Agricultural Chemistry
Environmental Science
Food Safety

Background:

Lambda-cyhalothrin is a widely used insecticide in tea cultivation.
Understanding its residue dissipation is crucial for food safety and regulatory compliance.

Purpose of the Study:

To determine lambda-cyhalothrin residue levels in tea leaves after application.
To calculate the dissipation pattern, half-life, and safe harvest interval of lambda-cyhalothrin in tea.

Main Methods:

Field experiments conducted in Tamil Nadu, India, during the dry season of 2006.
Residue quantification in fresh green tea and black tea at various harvest intervals (0, 1, 3, 5, 7, 10, 14 days).
Analysis of dissipation kinetics, half-life, and determination of safe harvest intervals.

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Main Results:

Lambda-cyhalothrin residues dissipated exponentially in tea leaves at both locations.
Residues fell below the European Union's maximum residue limit (MRL) of 1 mg/kg by the 5th day post-application.
The insecticide followed first-order dissipation kinetics with half-life values ranging from 2.8 to 3.5 days.

Conclusions:

A 5-day safety harvest interval is recommended for tea treated with lambda-cyhalothrin at the recommended dosage.
The findings support the safe use of lambda-cyhalothrin in tea cultivation when adhering to recommended intervals.