This research was conducted with the purpose to study the effects of insecticides (deltamethrin, chlorpyrifos, phosphin, and diatomaceous earth) on the insects control in stored corn seeds during 12 months, looking for an alternative products. Seeds of the hybrid BR 205 were treated with either isolated or combined deltamethrin and chlorpyrifos, phosphin, and diatomaceous earth; and further arranged into multifoliated paper sacks and stored for twelve months (May/1997 through April/ 1998) under normal environmental condition. The seeds were submitted to an infested seeds exam, mass of 100 seeds, germination test, cold test, accelerated aging test, electric conductivity test, emergence of seedlings in field and seedling emergence speed seven times in bimonthly intervals. The data analysis and the interpretation of the results showed that: deltamethrin and chlorpyrifos insecticides, alone or combined, phosphin, and diatomaceous earth promoted the control (similar manner) of pest-insects occuring during storage without causing toxicity to corn seeds; the physiological quality of corn seeds is effectively preserved by the addition of chemical insecticides and diatomaceous earth.