Five onion cultivars were crossed in a diallel and their progenies evaluated at Sokoto and Talata Mafara, during the 2004/2005 and 2005/2006 seasons. Thirty milliliter of 10-1 cfu of spore suspension of Alternaria porri was poured into each plot. Combined analysis indicated that location, recorded highly significant mean squares (p<0.01) for disease incidence, fresh and cured bulb yields. Genotype recorded highly significant (p<0.01) mean squares for all characters. Genotypexlocation interactions recorded highly significant (p<0.01) mean squares for disease incidence and severity and fresh and cured bulb yields.
L. Abubakar and S.G. Ado, 2009. GenotypexEnvironment Interaction for Resistance to Purple Blotch (Alternaria porri L. (Ellis) Cif.) in Onion (Allium cepa L.) in Nigeria. Asian Journal of Crop Science, 1: 15-25.