Abstract

This study was conducted to investigate the susceptibility and resistance status of Anopheles gambiaes.l to Pirimiphose Methyl at River Uke, Nasarawa State, Nigeria from May to July 2019. Anopheles mosquito larvae were collected from the upper and lower locations of the river usually between the hour of 9am to 2pm at the interval of two weeks by dipping and scooping methods. The samples were taken to Entomology Laboratory and Insectary of Nasarawa State University, Keffi and reared to adult stage. A total of three hundred (300) female Anopheles mosquito from each adult cage (Upper and Lower locations) were subjected to 20 µg does of Pirimiphose methyl for susceptibility test at a time interval of 0, 15, 30, 45 and 60 min for 24 h in which 25 mosquitoes were exposed to each of the 4-impregnated CDC bioassay bottles. The result indicate that susceptibility (98-100%) and possible resistance (97-98%) was observed at 60 min exposure time. Data analysis by ANOVA showed no significant difference between the Upper and Lower locations of the study area (p>0.05).