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A research was developed to determine the population density of the fly of the stigmas Euxesta spp., in different growth stages of the corn crop. The main objective of this research was to verify if there was variation in the population of adult flies of Euxesta spp. in different stages of growth of the corn plant, in a way that allowed us to establish appropriate and timely strategies for the management of this pest. For this purpose, three parcels of corn with an average size of 1 hectare were selected in three different growth stages; 45-51 dgd, 55-61 dgd and 65-71 dgd and four yellow adhesive traps were placed in each plot, distributed 30 m apart from one another. The traps placed remained in the field for a period of seven days. After this period, the traps were collected and evaluated, finding that the largest number of stigmata flies was recorded during the 65-71 ddg period, which coincided with the emission of the greatest number of stigmas in the plants.