An investigation was carried out at the Animal House cum Rodent Laboratory, Department of Entomology, Assam Agricultural University, Jorhat during 2013-14 to evaluate the efficacy of four anticoagulant rodenticides against commensal rodent, Mus musculus. The efficacy of anticoagulant rodenticides viz., brodifacoum, flocoumafen and difenacoum along with bromadiolone were evaluated against Mus musculus under no-choice and choice feeding trial. In both choice and no-choice feeding trials the efficacy of brodifacoum (0.005%) wax block was significantly better than flocoumafen (0.005%) and difenacoum (0.005%) but at par with bromadiolone (0.005%). In no-choice feeding trial, 100 per cent mortality was achieved with brodifacoum and bromadiolone within 4-7 days observation period but significantly lower mortality was recorded in flocoumafen (80%) and difenacoum (60%). The wax block formulation of difenacoum showed poor palatability as more consumption of plain bait was recorded over poison bait against test animals. Under no-choice test, the poison ingested between male and female were not significant in case of all the toxicants. The consumption of poison bait by the test animals of both the sexes under choice test was reduced in comparison to no-choice test because of availability of an alternate plain food along with the poison bait. The post treatment consumption of bait was significantly lower in case of brodifacoum and bromadiolone in comparison to flocoumafen and difenacoum. This shows the effectiveness of these two rodenticides viz. brodifacoum and bromadiolone against rodent species.

Comparative evaluation of second generation anticoagulant&nbsp;rodenticides against Mus musculus

An investigation was carried out at Regional Agricultural Research Station (RARS), Titabor and Instructional-Cum- Research Farm, Assam Agricultural University, Jorhat during 2013-14 and 2014-15 in boro and sali season respectively. The field trials were conducted to evaluate effectiveness by combining rodenticides with local bamboo traps against field rodents in rice. Combined effect of rodenticides and traps were evaluated at different growth stages of rice against Bandicota bengalensis in terms of live burrow count (LBC/ha), trapping &nbsp;index (TI) &nbsp;as well as per cent cut tillers in both boro and sali rice, respectively. Baiting with bromadiolone (0.005%) at panicle initiation stage and bamboo traps at milky stage recorded the highest reduction in rodent population (72.39% LBC/ha, 70.57% TI and 68.13% cut tillers) in boro and (72.27% LBC/ha, 77.13% TI and 70.77% cut tillers) in sali rice over control at harvesting stage. The second best treatment in respect of per cent reduction of LBC/ha, trap index and cut tillers was bamboo traps at maximum tillering stage and bromadiolone (0.005%) at panicle initiation stage in both boro and sali rice, respectively which recorded a reduction of 65.89% LBC/ha, 66.19% TI and 65.66% cut tillers in boro rice and 68.33% LBC/ha, 71.04% TI and 62.83% tiller damage in sali rice&nbsp;

Comparative evaluation of second generation anticoagulant rodenticides against Mus musculus

Effect of rodenticides and traps against lesser bandicoot rat, (Bandicota bengalensis) in rice field