Laboratory bioassay studies were conducted to evaluate the effect of larval food of five plants viz., chickpea (Ciceraretinum L.), pigeonpea (Cajanuscajan Millsp.) cabbage (Brassica oleracae var. Capitata linn, cauliflower (Brassica oleracae var. Botrytis linn and linseed (Linum usitatissium L.) on the biological events of Helicoverpa armigera Hubn.