This study was conducted at Sakha Research Station, Agricultural Research Center (A.R.C), Egypt during (2021/2022 and 2022/2023) seasons. Eight lines and two testers of faba bean and their sixteen F1's resulted from a line × tester procedure were evaluated under nature foliar diseases infection to identify the kind of gene action, combining abilities and the extent of heterosis for ten important traits. The genotypes were compared using cluster analysis after being grouped in a bi-plot figure. Based on the seed yield data, the biplot-PCA results showed that there were substantial genetic variations between genotypes, response to foliar diseases (Chocolate Spot and Rust), and Maturity date. Estimation of the magnitude of variance due to general and specific combining ability effects (σ2A/σ2D) The two hybrids, Sakha1 × RV and Giza 429 × Marina, were the best for the majority of the attributes that were investigated and ought to be taken into account in breeding programs. The parental genotypes Sakha1, Nubaria1, Marina, and Sakha3 depicted their good combining ability. Mid-parent heterosis (MP%) was observed for all studied traits, while heterobeltiosis (BP%) was
observed in some crosses for most traits. Based on the heterobeltiasis (BP %), the hybrids Sakha1 × RV 322, Giza 843 ×
RV 322, and Sakha1 × Marina were the most superior in yield and relevant traits.