Dissipation of lambda-cyhalothrin 5% ec on brinjal fruit grown in Gurugram, Haryana

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.

The analytical method for the determination of Lambda-cyhalothrin 5% EC (Test Item) on brinjal was validated as per DGSANTE 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=30g a.i/ha) were 500 L/hectare for Trial. Lambdacyhalothrin 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.

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 10^th day, similarly for the double dose (T₂) the initial dissipation was 57.14%, which increased to 99.7% after 10^th day. The half-life (T_1/2) values of Lambda-cyhalothrin on brinjal were found to be 2.06 and 2.13 days for T₁ and T₂, respectively.