Background: The introduction of synthetic pesticides Lambda-cyhalothrinin for crop protection in general has significantly contributed to increased productivity. Lambda-cyhalothrin have been reported to cause toxic effects on humans, ranging from short-term effects such as headaches and nausea to chronic effects like cancer, reproductive damage and endocrine disruption. Lambda-cyhalothrin is a type-II highly active synthetic pyrethroid insecticide which contains a-cyano group. Lambda-cyhalothrin applied at the rate of 30 g a.i. ha-1 was found to be effective against shoot and fruit borer on brinjal.
Methods: The analytical method for the determination of Lambda-cyhalothrin 5% EC (Test Item) on brinjal was validated as per DG-SANTE 2019 guideline. The field trails including the dissipation study and final residue study were conducted in a randomized block design in open field. As per recommendation, dose of test item (T1= 15 g a.i/ha; T2 = 30 g a.i/ha) were 500 L/hectare for Trial. Lambda-cyhalothrin residues of brinjal samples were determined at 0, 1, 3, 5, 7 and 10 days at both application of recommended and double the recommended dose of test item. Result: The analytical method employed for determination of persistence residues of Lambda-cyhalothrin in brinjal was validated and found accurate and precise. The per cent dissipation of Lambda-cyhalothrin for the treatment T1 was 37.22% after 1 day which increased to 96.66% by 10th day, similarly for the double dose (T2) the initial dissipation was 57.14%, which increased to 99.7 % after 10th day. The half-life (T1/2) values of Lambda-cyhalothrin on brinjal were found to be 2.06 and 2.13 days for T1 and T2, respectively.
A novel ultra fast liquid chromatography (UFLC) method has been developed and validated for quantification of Buprofezin in Suspension Concentrate (SC) formulation, using Shimadzu, packed with C18 (250 mm × 4.6 mm, 5 μm) column. Mixture of acetonitrile:water (80:20 v/v) was used as mobile phase. The flow rate was kept 1.5 ml/min and detection was carried out at 250 nm. The linearity of proposed method was investigated in the range of 200-1002 PPM (r2=0.999). The percentage recovery found to be 99.87%. The % RSD value for precision study was <0.68 as per modified Horwitz equation as requirements by CIPAC. The developed method was found to be specific, linear, precise and accurate. This method is also useful for quantification of Buprofezin in their single or combination formulated products, environmental samples (soil, water), and agricultural products for pesticide residue analysis.
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