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The nature and magnitude of gene action was analysed in six generation mean for resistance to shoot and fruit borer related characters of four crosses in brinjal. Study indicated that magnitude of dominance effect was higher for almost all the characters except per cent infested shoots, fruit length, pedicel length, days to 50% flowering and fruit skin thickness. Epistatic component additive x additive (i) and dominance x dominance (l) were involved in the expression of most of the characters. Duplicate type of epistasis was observed for most of the crosses. Significant epistatic gene effects coupled with duplicate epistasis indicated that through effective selection, transgressive segregants could be obtained in the subsequent generations.
