The crop losses caused by pests and diseases are huge. But, the knowledge on the crop loss at the farm level is very much limited. In addition to losses that occur during the growth period of the crop, there is a huge quantity of grains lost during the process of harvesting, threshing, transportation and storage. Therefore, the present study makes a comprehensive attempt to estimate the dimension of losses occurring during the pre and post harvest stages of paddy and wheat crops. For the purpose, required primary data were collected from 120 wheat and paddy growing farmers of various farm size categories from Ludhiana and Ferozepur districts.  The individual production loss in wheat crop due to incidence of pests (aphids), diseases (yellow rust and loose smut) and weeds (Phalaris minor and broad leaf weeds) was less than 5 per cent of total production with more severity of incidence of weeds. The magnitudes of crop loss due to pests, disease and weed infestation in wheat crop over actual production increased with increase in farm size with a minimum of 5.94 per cent on marginal and 8.29 per cent per acre on large farm categories. Thus, marginal farms were better managed in wheat crop due to smaller size. Total, magnitude of crop loss due to pests, diseases and weed infestation was 7.93 per cent over actual and 7.35 per cent over normal production in wheat crop. Similarly, in paddy crop also, the individual production loss due to incidence of pests (rice stem borer, leaf folder and plant hoppers), diseases (bacterial leaf blight, sheath blight and false smut) and weeds (Echinochloa crusgalli) was less than 5 per cent of the total production with more severity of pests. The losses due to biotic stresses in case of paddy crop also increased with increase in farm size, except on marginal farms, the loss per acre being a minimum of 6.07 per cent on small and 8.94 per cent per acre on large farm category.  The total magnitudes of crop losses due to biotic stresses in paddy crop were 8.68 per cent over actual and 7.99 per cent over normal production. The loss due to major pests, diseases and weeds was low due to the efficient crop management by the farmers as well as varietal characteristics and timely application of weedicides/ pesticides/ fungicides. Harvesting loss in case of wheat crop was more in late season harvesting while in paddy both early and late season harvesting was reported as harmful resulting in higher yield loss. The post harvesting losses such as transportation, handling and rodents attack in case of stored grains was found to be negligible in case of both the crops. Total post harvest losses in wheat crop came out to be as low as 1.412 kg per quintal on marginal farms while on large farms, these losses were 1.865 kg per quintal. The total, post harvest losses in wheat crop worked out to be 1.84 kg per quintal and 35.81 kg per acre as revealed by the sample households. These losses in wheat crop increased with the increase in farm size. Similarly, total post harvest losses in case of paddy crop were calculated as 3.674 kg per quintal on medium farm category which were lowest while on marginal farm category these came out to be 6.023 kg per quintal which were highest on all the farm categories. The total post harvest losses in paddy crop worked out to be 4.43 kg per quintal and 122.38 kg per acre with major loss due to decline in weight as revealed by the sample respondents. The transportation losses were low due to easy availability of mechanized transport facility to most of sample households as well as special care accorded by putting gunny as well as plastic covers, beneath as well as on the sides of the trolley before filling it with the crop produce while transporting grains to the market. The storage losses were also found low in wheat crop due to scientific storage practices adopted by them using steel drums/silos and undertaking proper fumigation using cellphos tablets and or making it airtight by applying wet soil on openings of the steel drums. The sample farmers exclusively stored wheat crop for domestic consumption and for next year’s seed purpose only. The major household suggestions to minimize pre harvest losses were the need of development of insect/pest and disease resistant varieties, availability of effective and unadulterated pesticides, and better quality seeds. To minimize post harvest losses households suggested for proper supervision of the crop at the time of harvesting particularly in case of lodged and over ripe crop, development of technologically advanced harvester combines and skilled persons required to operate them to minimize the wastage during harvesting. The major policy issues suggested were to keep a check on private input dealers to stop exploitation of the farmers due to charging of exorbitant input prices, need of new training programmes for timely and cheaper control of pests and diseases, rejuvenation of Govt. extension agencies for curtailing the dependence of farmers on private input dealers, ensuring timeliness in harvesting of wheat and paddy crops and offenders be penalized for the lapse while storage losses of foodgrains for household consumption can be further contained by imparting training to the farmers regarding control of rodents and fungus attack.