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Related Experiment Videos

Pyrethroid insecticide residues on vegetable crops.

B D Ripley1, G M Ritcey, C R Harris

  • 1Pesticide and Trace Contaminants Laboratory, Laboratory Services, University of Guelph, Guelph, Ontario, Canada N1H 8J7. bripley@lsd.uoguelph.ca

Pest Management Science
|August 24, 2001
PubMed
Summary

Pyrethroid insecticide dissipation varies by crop and chemical. Fenvalerate showed persistence on some vegetables, while permethrin, cypermethrin, and deltamethrin generally dissipated to acceptable levels within pre-harvest intervals.

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Area of Science:

  • Agricultural Science
  • Environmental Chemistry
  • Entomology

Background:

  • Pyrethroid insecticides are widely used in agriculture.
  • Understanding their dissipation rates is crucial for food safety and environmental protection.
  • Vegetable crops have varying susceptibilities to pesticide residues.

Purpose of the Study:

  • To determine the dissipation rates of specific pyrethroid insecticides on various vegetable crops.
  • To assess the persistence of fenvalerate, cypermethrin, permethrin, and deltamethrin residues.
  • To evaluate if residues decline to acceptable levels within standard pre-harvest intervals.

Main Methods:

  • Foliar application of pyrethroid insecticides on selected vegetable crops.
  • Monitoring residue concentrations over time post-application.

Related Experiment Videos

  • Quantification of insecticide residues using analytical methods.
  • Comparison of dissipation rates across different crops and insecticides.

    • Main Results:

    • Fenvalerate exhibited persistence on Chinese broccoli, mustard, and cabbage, with residues above 0.1 mg kg-1 at day 21.
    • Cypermethrin dissipated below 0.1 mg kg-1 within 10-19 days on lettuce varieties.
    • Permethrin, cypermethrin, and deltamethrin generally declined to acceptable levels within pre-harvest intervals on asparagus, carrots, eggplant, onions, and tomatoes.

    Conclusions:

    • Most tested pyrethroids (permethrin, cypermethrin, deltamethrin) dissipate effectively on various vegetables.
    • Fenvalerate's persistence on certain specialty crops may necessitate higher residue limits or alternative pest management strategies.
    • Dissipation rates are influenced by the specific insecticide, crop type, and environmental factors.