Spatial and temporal changes in the abundance of Helicoverpa (= Heliothis) armigera (Hubner) in India

A pheromone trap network was used to study the temporal and spatial variations in the abundance of the pod borer, Helicoverpa (= Heliothis) armigera (Hubner) in India. The pattern of pheromone trap catches of Helicoverpa armigera was similar within any given agroclimatic zone but there were also obvious changes with latitude in patterns of trap catches. The catches were generally higher and had more sharply defined peaks, at northern locations than at southern locations. The catches at the eastern locations were lower than those elsewhere. The practical applications of this information for pest control are discusse