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The present investigation was conducted to understand the genetics of resistance to northern leaf blight in maize through six generation mean analysis in three crosses viz., PH234 X PH84K, PHM6M X PH17H and PHM6M X PHY0Z during kharif 2016-17. The scaling tests and joint scaling tests indicated the inadequacy of additive-dominance model and showed the presence of epistatic gene effects in all the three crosses for northern leaf blight. Further study revealed the importance of additive, dominance and additive × additive gene effects in the expression of the disease. The magnitude of dominance effect was more compared to additive gene effects. Duplicate gene interaction was evident in the inheritance of northern leaf blight resistance in all the crosses. The study also revealed that genetic architecture of northern leaf blight resistance was population specific. Both, additive and non-additive components were found important suggesting reciprocal recurrent selection as more effective for developing northern leaf blight resistant maize genotypes.

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