ASSESSMENT OF COST EFFECTIVENESS OF NEEM SEED EXTRACT AND CYMETHOATE EC25 FOR THE CONTROL OF INSECT PESTS OF FRENCH BEAN Neem seed extract obtained from the neem tree(Azadirachta indica A. Juss)was evaluated at the university of Ghana farm,Legon for the control of insect pests of french bean. The neem seed extract was applied at the rate of 50g/L,75g/L,100g/L, Cymethoate EC25 2ml/L and control (water)as standard checks. The type of insects which visited the french bean plants were sampled and the nature of damage caused was determined by visual observation. The major insect pests collected include grasshoppers(Zonocerus variegatus),Green leafhoppers Empoaca spp, Gryllotalpa africana,Prodenia litura, beanfly Ophiamyia spp Lagra cuprina, Taeniothrips and other beneficial insects, There were significant differences in the various treatments compared to the control. Cymethoate EC25 and the neem seed extracts were equally effective but the neem treated plants were found to be associated with a fungus diesease caused by Choanephora spp. The 50g\L concentrationof the neem seed extract was found to be cost effective in applying as an alternative insecticide to control french bean insect pests in Ghana