Food consumption and larval performance values (mean ± SE) of 3rd instar larvae of Spodoptera litura feeding on different potato cultivars. (A): relative growth rate (RGR), (B): relative consumption rate (RCR) and (C): efficiency of conversion of ingested food (ECI). Alphabets at bar tops indicate significant difference among the treatments (one-way ANOVA; HSD at α = 0.05).