Studies on correlation of pheromone trap catch of H.armigera (hubner) with larval population in field and weather parameters

Correlation between pheromone trap catch and larval population of Helicoverpa armigera (Hub.) and influence of weather parameters with moth population was studied during December-April’ 2010. Data indicated that the H.armigera moth was first trapped in 2^nd fortnight of December with an average of 2.55 moths/trap and showed two peaks i.e in 1^st fortnight of January and 2^nd fortnight of March, respectively. The correlation between moth population and next fortnight larval population of H.armigera and mean relative humidity was found to be positively significant while correlation with maximum temperature, minimum temperature, and sun shine hours was found negative but non-significant.