A number of field experiments was conduced at the experimental farm of Rice Research and Training Center (RRTC). Sakha. Kafr El-Sheikh. Egypt during 2003. 2004 and 2005 seasons to evaluate best promising hybrid combinations developed in Egypt in comparison by best local inbred varieties. The hybrid and inbred varieties were grown in a randomized complete blocks design with four replications. The objectives were: 1. To evaluate the experimental hybrids for grain yield and yield advantage over the best check variety (SH%). 2. To evaluate the hybrid rice combinations and its parental lines to stem borer infestation under field conditions and blast reaction under both field and green house conditions. Out of 20 hybrid combinations tested against Giza 170 in 2003 seasons. 14 hybrids under normal soil conditions and 15 under saline conditions significantly exceeded the average yield. yield advantage and standard heterosis (SH%) over   Giza 1TB.   Six of promising and released hybrids were dominated. promoted selected for further evaluation of yield and resistance to rice stem borer (R38) and rice blast reaction in 2004 and 2005 seasons. All the six selected hybrids surpassed all the inbred check varieties with at least one tonfha. For resistance to stem borer. the parental lines of cytoplasmic male sterile lines, lRBBBBBA. IRBBBQYA. lR68902A and lR69625A and the restorer lines GZ5121R and GZ5934R were moderately resistant to stem borer. Out of 20 hybrids. Mo hybrids( namely SK2045H and SK2047H) were resistant to this insect. However. four hybrids, SK2032H. SK2037H, SK2046H and SK2051H exhibited moderate level of resistance. Meanwhile, out of the six promising hybrids. SK2035H was moderately resistant. For blast resistance. the CMS lines lR65885A, lR68886A. IRSBBBBA. lRGBBQTA and lR68902A were resistant under both field and greenhouse conditions. On the other hand, IR69625 was susceptible under Sakha location only and susceptible to lG—1 isolate under greenhouse. However. most of the restorer lines were resistant at all locations in the field and for all three isolates under greenhouse except for Giza 175R that was susceptible. All the hybrids tested were resistant to blast under both field and greenhouse conditions.