There was a gradual build up of female population of H. armigera on semi-synth- etic diets and male population on natural hosts. There was an increase of oviposition period to the extent of 12.6 per cent from first to second generation in all the diets. The adults lived longer upto 14.5 days when the larvae had fed on diet-A, while it was only. 12 days in all the other diets. The increase in fecundity from first to second generation was marked in diet-A, from 661 to 918 eggs per adult and this diet resulted in the maximum fecundity as compared to the other semi-synthetic diet (diet-B) as well as lab-lab and tomato.
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Tamil Nadu Agricultural University
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Tamil Nadu, India.
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