Rice black bug is the major pest of rice in Thiruvallur and Kancheepuram districts. Yield loss at 10 bugs per hill in susceptible cultivars was estimated as 23%. In this context, biopesticide like neem oil (3%), Metarhizium anisopliae (1 x 108 spores) and new molecules profenophos (1000 ml/ha.) were tested against black bug. The results revealed that black bug population was found to be significantly low in profenophos (1000 ml/ha.) sprayed plots 2.0 no./hill. Population reduction was 60.8% followed by Metarhizium anisopliae (1 x 108 spores) applied plots. In neem oil applied plots black bug population ranged from 3.0 no/hill to 3.3 no. /hill whereas control plot recorded the maximum population of 5.1 bugs / hill.