author(s)
Chaman Kumar and PK Singh

abstract
The investigation was carried out at Research Farm of Birsa Agricultural University Kanke, Ranchi during summer 2018. The mean population of thrips were commenced from third week after sowing and reached to its peak 18.0 thrips/5 plant during 8^th week after sowing i.e. 19^th standard meteorological week of May, 2018. Thereafter it declined gradually when maximum temperature (39.0 °C), minimum temperature (22.7 °C), relative humidity maximum (84.7%) and minimum (40.9%) and rainfall (5.3mm) were recorded. The thrips population were recorded maximum during flowering to pod filling stage of mung bean. The correlation study indicated that the correlation between thrips population and temperature (maximum and minimum) were exhibited positively significant and non-significantly negatively correlated with maximum relative humidity and also non-significantly correlated with minimum relative humidity. When rainfall was taken in to consideration then population of thrips non-significantly correlated with rainfall.