Abstract
Background: Helicoverpa armigera (Hübner) is an important biotic constraint to major grain legumes in India. Biological characterization of any pest species is critical for making effective management decisions. Thus, this study comprehensively presents the biological and reproductive demographic traits of different geographic populations of H. armigera across the country. Methods: In this field-laboratory investigation (2015-18), populations from 20 localities were evaluated for developmental period of all the life stages, survival and reproduction and growth and fitness indices. All these parameters were recorded from the maintained insect cultures of each location from second filial (F2) generation.Result: The mean developmental periods of the immature stages, as well as adult longevity, were found to be longest in the Cooch Behar population. In contrast, the populations from South Zone took significantly shorter duration over others to complete their life cycle. All the populations were found to be female-biased, but significant differences were observed for reproductive competence of female moths. Wide variations were also observed in the relative growth and fitness indices, with the highest recorded from Varanasi population. Cluster analysis differentiated studied populations into two distinct groups. Such variations seem to be due to probable genetic heterogeneity in H. armigera populations of India.
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