The results of the gradation grouping of corn hybrids showed that among the self-pollinating lines of the working collection 28.0% had a high crop, 50.0% had an average yield and 22.0% had a low yield. At the same time 10.5% of simple hybrids belonged to the group with high crop, 54.6% – to that with an average one and 34.9% – to low yielders. The fact that these 10.5% of hybrid combinations with the yields higher than 5.5 t ha-1 contain hybrid combinations with complex resistance to diseases and pests, which were created on the basis of our self-pollinating donor lines resistant to entomo– and phytopathogens, confirms the principles we formulated as to selecting parental pairs. The most uniform distribution was recorded as to damaging by the European corn borer, a high resistance to which is characteristic of 42.0% of self-pollinating lines and 29.1% of simple hybrids.