The invasive, Chilo partellus (Swinhoe) in Africa is attacked by diverse natural enemies in sorghum ecosystem. Field survey were conducted during 2016/17 and 2017/18 across Kalu Bati and Dawa Chefa districts of south Wollo and Oromia zones, Ethiopia to determine the relative abundance of C. partellus and natural enemies at all developmental stages of sorghum. 9 sorghum fields each was sampled at all growth stages using 4m2 quadrat. The study revealed C. partellus abundance increases with time and it was high at the lower stages in all districts with the highest (100%) relative abundance from Dawa Chefa in 2017/18. C. partellus abundance decreases as the plant grows older in both seasons. Four predators namely: ants, spiders, earwigs and ladybird beetles were recorded from sorghum. Among predators’ ants and earwigs were found the most abundant species attacking this pest at the late growth stages at kalu with (33.3%) and Dawa Chefa (26.3%) relative abundances, respectively. Spiders and Ladybird beetles were recorded as dominant predators at vegetative stages from Bati and Kalu with (22.3%) and (23.0%) relative abundances, respectively. In conclusion, across the regions the importance of C. partellus population and these natural enemies on different growth stages of sorghum appears to be increasing.

Keywords: Chilo partellus, natural enemies, relative abundance, growth stages, sorghum.