High phenotypic coefficient of variation and genotypic coefficient of variation were observed for percent potato apical leaf-curl disease (PALCD) incidence at 40, 60 and 80 DAP, whitefly population at 20 and 30 DAE and phenols. High heritability (broad sense) along with genetic advance as per cent of mean was found in plant height at 60 DAP, per cent PALCD incidence at 40, 60 and 80 DAP, whitefly population at 20, 30 and 40 DAE, phenols, number of stomata per leaf, foliage senescence at harvest, plant vigour at 60 DAP and total yield, indicating simple selection method for the improvement of these traits. Correlation studies revealed that per cent PALCD incidence was found significantly and positively associated with whitefly population and number of stomata per leaf, which indicates that for improving disease resistance, selection should be made for those lines, which have less number of whitefly and number of stomata. The per cent PALCD incidence was significant and negatively associated with plant height, plant vigour, weight of stem per hill, weight of leaves per hill, weight of foliage per hill, leaf area index, total yield, marketable yield, harvest index and phenols which suggests that for potato apical leaf-curl disease resistance, selection should be made on the basis of high values of these characters. Path analysis indicated that the per cent PALCD incidence had positive and highest contribution (1.941) towards plant height at 60 days after planting. Highest indirect contribution was exhibited by plant vigour at 60 days after planting (-0.032) Low population of whitefly, less number of stomata and high phenols were the main characters contributed towards potato apical leaf curl disease resistance.

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