The influence of host genotype X environment Interactions on the response of cassava anthracnose disease in diverse agro-ecologies in Nigeria

Nine cassava ( Manihot esculenta ) genotypes were grown for three years (1992-1993, 1993-1994 and 1994-1995) in three agro-ecological zones in Nigeria to study their reaction to cassava anthracnose disease (CAD), caused by Colletotrichum gloeosporioides , investigate genotype x environment (G x E) interaction patterns for their reaction to anthracnose, and to identify genotypes with stability of resistance to the disease. Mean squares for environments, genotypes and G x E interactions were highly significant (P Keywords : AMMI model, colletotrichum gloeosporioides, manihot esculenta RESUME Neuf genotypes de manioc ( Manihot esculenta ) etaient cultives pour trois annees (1992–1993, 1993–1994 et 1994–19995) dans trois zones agro ecologiques au Nigeria en vue d\'etudier leur reaction a la maladie d\'anthracnose du manioc (CAD), causee par les Colletotrichum gloeosporioides, examiner les modeles d\'interaction genotype x environnement (G x E) pour leur reaction a l\'anthracnose, et identifier les genotypes ayant une stabilite de resistance a la maladie. Les carrees des moyennes pour les interactions environnements, genotypes et G x E etaient significativement elevees (P Mots Cles : Modele AMMI; Colletotrichum gloesporioides; Manihot esculenta African Crop Science Journal Vol. 13(1)2005: 1-11