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Biopesticides offer a sustainable alternative to chemical pesticides, utilizing microbial agents to control agricultural pests. Bacillus thuringiensis (Bt) is a widely employed bacterium known for its potent insecticidal activity. Bt biopesticides are favored for their specificity to insect pests, minimal environmental impact, and natural degradability.Mechanism of Bt Toxin Action Bt produces insecticidal crystal (Cry) proteins during its sporulation phase. These proteins form parasporal...

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Protocols for Robust Herbicide Resistance Testing in Different Weed Species
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Persistence behaviour of thiamethoxam and lambda cyhalothrin in transplanted paddy.

Suhrid Ranjan Barik1, Pritam Ganguly, Samir Kumar Kunda

  • 1Department of Agricultural Chemicals, Bidhan Chandra Krishi Viswavidyalaya, Mohanpur, West Bengal, India.

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|August 13, 2010
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This study tracked thiamethoxam and lambda-cyhalothrin insecticide residues in paddy crops. No detectable residues were found in harvested paddy, straw, grain, or soil, indicating rapid degradation.

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Area of Science:

  • Agricultural Science
  • Environmental Chemistry
  • Pesticide Science

Background:

  • Insecticide resistance is a growing concern in agriculture.
  • Understanding pesticide persistence is crucial for food safety and environmental protection.

Purpose of the Study:

  • To determine the persistence and degradation of thiamethoxam and lambda-cyhalothrin in paddy crops.
  • To assess residue levels in harvested produce and soil after application.

Main Methods:

  • Field study conducted on paddy during the Pre-Kharif season.
  • Application of a 'Readymix' formulation (Alika 247 ZC) containing thiamethoxam and lambda-cyhalothrin at two dosage rates (33 and 66 g. a.i. ha⁻¹).
  • Residue analysis using High-Performance Liquid Chromatography (HPLC) for thiamethoxam and Gas-Liquid Chromatography (GLC) for lambda-cyhalothrin.

Main Results:

  • Thiamethoxam exhibited half-life values ranging from 5.2 to 5.8 days.
  • Lambda-cyhalothrin showed a half-life of 4.8 days.
  • No detectable residues of either insecticide were found in harvested paddy, straw, grain, or soil samples.

Conclusions:

  • Thiamethoxam and lambda-cyhalothrin demonstrate rapid degradation in paddy ecosystems.
  • The applied insecticide doses did not lead to persistent residues in the harvested crop or soil, suggesting a favorable environmental profile for these pesticides in paddy cultivation.