The experiments were conducted in two parts under laboratory and field conditions. Laboratory tests were performed in 5 treatments under choice and non-choice feeding conditions. In the single feed experiments M. socialis consumed on an average 4.7±0.36 g/animal Baraki-pellet, 4.5±0.4 g/animal Lanirat and 4.2±0.3 g/ animal Baraki-wax block. Food preference was determined as 45.39%, 21.58%, 19.44% and 13.57% for carrot, Baraki-pellet, Lanirat and Baraki-wax block respectively. Toxicity symptoms like nose and anal bleeding were observed from the 4th day and 100% mortality was observed from the 6th day up to the 10th day of the experiment. In the second part, the experiments in the field were performed using completely randomized block design in four replicates with three experimental blocks and one control, each about 1000 m 2. Five g/complex burrow of Baraki with pellet and wax block formulations and Lanirat with granular formulation were used in the three experimental blocks respectively, the fourth block being kept as control without any rodenticide use. Percent efficacy was estimated using Henderson and Tilton (1955) formula. Ninety one, 82 and 64% efficacies were observed for the above-mentioned formulations respectively.
)