الفهرس 
Introduction
Tomato production in EgyptOnly 14 pages are availabe for public view
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Abstract
In Egypt there are many commercial varieties, but they are not resistant to late blight disease, which is one of the most important and most serious fungal diseases that destroy the tomato crop in all its parts and which is caused by the egg disease Phytophthora infestans. The wild genotype in addition three cultivars of tomato were resistant to late blight, had confirmed polygenic resistant genes to late blight, and were used as a source of pollens, were obtained from the Asian Development Center for vegetables. And crossed between them and their varieties widely cultivated under Egyptian conditions with a (partial dialle mating design ) to obtain all possible crosses in the Bramoun-Dakahlia research farm and were sprayed using Phytophthora infestans zoospore suspension to runoff with a hand sprayer. The seeds of the following genotypes were obtained (the seven parents, five first generation, five second generation, five BC1 hybrids for the first parents, and five BC2 for the second parents) was evaluated under laboratory conditions the main results obtained were as follows: Estimates of additive gene effects were of low, magnitude. Epistatic gene effects were considered to be more important than additive gene actions in the inheritance of resistance to Phytophthora infestans in the crosses were studied. The additive x additive, additive x dominance and dominance x dominance gene actions were highly significant, for most crosses so the different breeding programs depending on hybridization such as the reciprocal recurrent selection breeding program is the best method to improve the resistance to Phytophthora infestans.