ABSTRACT
The effects of Nerium ole and er leaves extracts were used in attempt to control the Bulinus truncatus snail which is the intermediate host of Schistosomiasis in Iraq. The powder of N.ole and er leaves was dissolved in water [50 mgl/1]. The study was carried out in a river that contains this snail in Al-Rasheed district about 25 Km south of Baghdad. Three stations were chosen for this study, the distance between each station is 500m. The first station was the control station; the water of second station was treated with the leaf extracts. The study showed high effects of N.ole and er extracts to control B. truncates. The effect in the third station were less than that f the second station because of dilution of the extract during its flow in the river. The effect of this extract was represented by mortality, the snails attempt to escape from the exposure media, disorders and troubles of behaviour in the submerge activity throughout the exposure [96hr]. The effect of the N.ole and er extracts was limited for the treated area only. This study showed the ability to use the N.ole and er extracts to control the snail B. truncatus.