The treatment with pendimethalin 0.75 kg ha−1 recorded 38–53% lower density of G. pensylvanicum as compared to the weedy check at 70 DAS but these differences were nonsignificant (p > 0.05). The interaction effect of the cropping systems and weed control treatments on density of G. pensylvanicum were significant at 105 DAS in both the seasons (p < 0.05).