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. |
