.Nine white inbred lines of maize were crossedin a diallel crossessystem . in ·2000 growing season. Inbred lines and F's sinqle crosses, 'i/hich evaluated in'
three experiments at Sahka location in 2001 growing season .The first experiment
was carried out under normal' condition for grain yield and late wilt disease. The
second 'experiment - was under artificial infections for downy mildew' disease. The
third experiment was in laboratory to determine the presence of kernel rot caused
by Fusarium monititoime and Penicillium spp. Data were genetically analyzed by
the procedures developed by Griffing (1956). Genotypes and their arthognals,
parents (p), crosses (c) and P vs c mean squares reached the significant level of
probability for all studied traits. except kernel rot diseases which caused by
Fusarium moniliforme and Penicillium sop. for parents and crosses and kernels
miosture for p vs c. The-mean squares associated with general GCA and specific
SCA combining abilities were significant for all studied traits except GCA for
Fusarium monilitorme and Penicillium sop. diseases. .               . The 'ratio a2A I a20 showed greater important of dominance gene action in the inheritance of grain yield, silking date, Fusarium moniliforme and Penicillium
spp. While additive gene action showed great importance in the inheritance of
kernels moisture, downy mildew and late wilt resistance. The estimates of average degree of dominance indicated over
dominance in all studied traits except kernels moisture and downy mildew
resistance, which was partially dominant. The broad sense heritability est-mates
were high for all studied traits except kernel rot diseases. Grain yield was negatively correlated with silking date and infection by
Fusarium moniliforme and Penicillium spp .. while positively correlated with iate wilt resistance.             ' The parental lines SK-4054, S062/E. SD34/E and SK6056 wer~ the best
general combiners for grain yield. resistance of some maize diseases and
earliness. The four crosses. i.e. S07/E x S034/E. SD34/E x SK-4054. SD34/E x
SK-6056and S062/E x SK4054 had superiority in most studied traits. The above
new hybrids could be use to improved the yieldrng ability and early maturity in maize breeding programs