Present Scenario of global warming gives rise to the climate change; which resulted in life cycle disruption of many beneficial as well as pest insects, to boost this problem some insects changed their life according to climatic conditions. Locally available weed plant Chrozophora plicata of family Euphorbiaceae was used for study. In present investigation Antifeeding and Larvicidal activity was recorded for the methanolic extract of C. plicata. Results showed that potential antifeedant, larvicidal and growth inhibiting activity against Spodoptera littoralis a serious polyphagus pest. Use of such plants could be remedy from insect pests and weeds too.