In a study of the effect of initial infestation of chickpea, with one, two, three, four and five sexual pairs of pulse bruchid, up to F1(one generation) and F2(two generations), a highly positive correlation (r= 0.949) occurred between population in the F1and the number of pairs of beetles, but not up to F2generation. Significant correlations ofr= 0.921 andr= 0.385 between grain damage (%) and final population also occurred for the F1and F2generations, respectively, also high positive correlations (r= 0.974 for F, andr= 0.959 for F2) between loss in grain weight and population. The coefficients of determination revealed that 97% and 92% variability in loss in grain weight was due to the number of pairs of beetles initially released, their final population and per cent grain damage, for the F1and F2generations, respectively.