Abstract: All larval instars of the cotton leafworm, S. littoralis were found susceptible to sorghum seedlings extract which markedly affected the viability of eggs, particularly 3-day old eggs and neonate larvae. Latent effects of the extract on subsequent instars of survivors was also obvious as retarding development, shortening of adult longevity and reducing egg production / female moth. Indirect effects of sorghum extract on the parasitoid, M. rufiventris were studied in relation to egg-larval development, pupal period, percent parasitoid emergence and adult longevity.