Control of dipterids in a feedlot under construction in a forest area of center region of Cameroon

Abstract

The forest agro-ecological zone of Cameroon is heavily infested with biting dipterids, but no control is ongoing in this part of the country. In the rainy season (May 2022) in a feedlot under construction in Ndogbea village, eight days entomological study consisting of (i) baseline fly collection using five vavoua traps set in all the sides of a one hectare feedlot yard for four days and (ii) installation of deltamethrin impregnated screens set at 1m from trap and their spraying at frequency of two days in four days. About 1368 biting and non-biting dipterids were collected and classified under five important genera namely Musca, Stomoxys, Tabanus, Chrysops, and Glossina. Musca spp. were frequent than other species. Only one Glossina fuscipes fuscipes was identified. The vavoua trap (VT4) facing the forest with canopy trees had highest fly catches. The apparent density (ADT) of all the fly genera dropped from pre-screen installation phase (ADT=86.8flies/trap/day (f/t/d)) to screen installation phase (ADT= 38.2 f/t/d) with overall fly population density reduction rate of 55.99%. However, there was no statistically significant difference (Χ²=35.000; df =30; P=0.243) in population density reduction rates of the various fly-groups. In conclusion, five dipterid groups of veterinary and zoonotic importance constituted the fly-vector fauna of Ndogbea village. The presence of deltamethrin impregnated screens contributed to the fly population density reduction rate of 55.99%. An integrated approach including: animal spraying, herd hygiene, use of traps and screens is needed to maintain low fly numbers in this feedlot.