Yield stability of some bush snap bean genotypes in Uganda

Abstract

Pod yield stability was studied on fourteen snap bean genotypes introduced or locally bred in Uganda. The study was carried out in three seasons using six agro- ecological zones. All the six non commercial genotypes had been gene pyramided for rust, Angular leaf spot and common bacterial blight making them tolerant to the diseases. J12 had the highest yields and the commercial variety Paulista had the lowest. Values of bi coefficient indicated that varieties had the highest positive influence on pod yields while location and season had higher negative influence than rust. Variety J 12 and SB001 had the most stable and heavy pod yields Population dynamics showed that Paulista and Angela had the most unstable plus lowest yields.