Ability to convert digested food into growth: relation between larval weight gain and the subtraction of weight of frass produced from weight of the food ingested during the last instar of <i>Helicoverpa armigera</i> larvae fed on a diet with the Bt and non-Bt leaves.

<p>Bars show least significant differences (P<0.05) for each mean in the ANCOVA of weight gain when ‘food intake-faeces’ is the covariate.</p>