Evaluation of lac based slow-release pesticidal formulations for the effective control of cockroach

Lac based chlorpyrifos monolithic formulation were assayed on german cockro ach Blatella germanica The addition of bleached lac as matrix into 1, 2 and 3 per cent chlorpyrifos solution in spirit resulted into slow-release of a ctive pesticide when applied on a surface. Study of various formulations wi th and without bleached lac matrix revealed that after one year of storage of wooden panels coated with formulation, the former took 3 hours and latte r (with low quantity of bleached lac) 18 hrs 42 mts for 90 per cent mortali ty of cockroach. The study established that bleached lac as matrix causes s low-release and prolongs activity of chlorpyrifos for efficient use.