The research aimed to study each of: the evolution of the area, production and productivity of tomatoes for the three loaves in Egypt, the development of economic indicators for tomatoes in Egypt, the development of marketing indicators for tomato crops in Egypt during the period (2005-2019), and study of the development of area, production and productivity of the summer tomato crop in Sharkia Governorate during the period (2005-2019), determining the relative importance of the area and the total production of the most important administrative districts producing summer tomatoes in Sharkia Governorate during the agricultural season 2019/2020, and estimating the productive and economic indicators for summer tomatoes in the field study sample for the year 2019-2020, and the economic estimate of the loss of summer tomatoes. Determining the factors affecting this loss, and estimating the economic effects of the loss from the crop on costs and revenues and irrigation water in the sample of the study, and also identifying the causes of the loss in summer tomatoes in Sharkia Governorate during the production and marketing phases and proposals to reduce the loss, and the research relied on the two methods of descriptive and quantitative analysis and the use of some methods Statistical data such as arithmetic averages, percentages, and stepwise multi-stage regression analysis methods of estimating losses on the data obtained from the personal interview of the farmers of the study sample, and the research relied on the published secondary data and random sample data from summer tomato farmers in Sharkia Governorate. The sample size was 120 farmers with 60 farmers from each district. The most important results were that the average area of tomatoes for the total lugs was about 504.81 thousand faddans, reaching a maximum of the summer loop by about 217.67 thousand faddans, then the winter loop by about 215.9 thousand faddans, then the the indigo by about 71.24 thousand faddans during the period (2005-2019), and the average available for the consumption of tomatoes is about 8330.92 thousand tons, and the average loss of tomatoes amounted to 2114 thousand tons, and the average surplus of tomatoes was about 668.2 thousand faddan, while the average self-sufficiency of tomatoes amounted to 112 thousand tons, and the total productive and marketing losses together amounted to 3.16 tons of tomatoes at a rate representing about 17.7% of the total production quantity. Total production losses amounted to 2.13 tons of tomatoes, representing about 11.95% of the total amount of production, at a value of about 4.9 thousand pounds, while the total marketing losses amounted to 1.03 tons of tomatoes, representing about 5.8% of total production, at a value of about 7.3 thousand pounds. The value of the qualitative loss represented by the loss in the case of sale at a reduced price amounted to about 3.3 thousand pounds. The total value of summer tomato losses is 15.6 thousand pounds، and it turns out that the total amount of losses at the sample level is about 25.2 tons, while at the level of Sharkia Governorate is 131.4 tons. It also turned out that the wasted area amounted to about 1.4 acres at a value of 6.8 thousand pounds at the level of the sample, and amounted to about 7.96 acres at a value of 38.2 thousand pounds at the governorate level, and since there is a waste in the cultivated area thus unifying a waste in costs amounting to 46.4 thousand pounds at the level of the sample, and about 261.3 thousand pounds at the governorate level. There is a waste of farm income amounting to about 89.1 thousand pounds at the sample level, and about 501.1 thousand pounds at the governorate level. There is wastage in water with a quantity of about 4.1 thousand cubic meters at the sample level