Uses of Thai medicinal herb (Derris elliptica (Roxb.) Benth) in control of fly larva population and its application in the treatment of cutaneous Myiasis in animals(Thai)

Abstract

Fresh Derris elliptica powder (FDP) and dried D. elliptica powder (DDP) were effective on killing fly larvae when compared to insecticide powder, Negasunt^ . DDP (containing 6.69% rotenone) was the most effective treatment which yielded cumulative death percentages of larvae at 38.0%, 70.0%, 80.0% and 88.0% after an exposure for 3, 6, 9 and 12 hours, respectively. FDP (containing 1.94% rotenone) yielded lower cumulative death percentages of 22.0%, 48.0%, 64.0% and 86% at the same exposure periods. Negasunt^ was also gradually effective in killing fly larvae and reached the same efficacy as DDP and FDP after the exposure for 12 hours. In vivo, DDP was effective in a treatment of cutaneous myiasis in pigs. All experimental pigs had normal appetite and condition throughout the experiment without any signs of side effect from DDP. Larvae exposed to DDP died within 24 hours and an inflammation caused by larval migration was gradually recovered within 7 days.