Seasonal incidence of gram pod borer, Helicoverpa armigera (Hub.) in chickpea under Jabalpur condition

Two peak periods of H. armigera larval population was observed during the entire season from 47^th to 50^th standard week and from 10^th to 14^th standard week in both the years of study. The larval population showed a positive correlation with minimum (r = 0.743 and 0.808 during 2009–10 and 2010–11, respectively) and maximum temperatures (r = 0.747 and 0.767 during 2009–10 and 2010–11, respectively), however, it showed negative correlation with relative humidity (r = -0.694 and -0.661) and rainfall (r = -0.324 and -0.108) during 2009–10 and 2010–11, respectively. There was a significant positive correlation between both minimum and maximum temperature and the pest incidence observed. The correlation coefficient indicated negative relationship between the larval population and rainfall.