Interferes with agricultural operations Loss of crop yield and quality of produce Higher crop losses over any other    agricultural pests Yield reduction due to weeds was estimated to be around. 15-20% in transplanted rice 30-35% in direct seeded rice 50% in upland rice  As per AICRP and DRR 34% in transplanted rice 45% in direct seeded rice 67% in dry paddy As per I.R.R.I Philippines Total loss of rice yield due to weeds (INDIA) = 15 mt/year Total loss of rice yield due to weeds (world) = 9.5% per year Cause more yield loss in Kharif over Rabi season. Acts as alternate hosts Ex:- Grassy weed (Leersia oryzoides) - alternate host or bacterial leaf blightPanicum SPP - alternate host for rice stem borer. Cause soil nutrient loss to an extent of 14 kg N, 2.3 kg P2O5 and 25.3 kg K2O when weeding is not done.

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