Progress in tree crop research in Nigeria: (cocoa, kola and coffee) - A commemorative book to mark the official dedication of the headquarters of the Cocoa Research Institute of Nigeria (Gambari Experimental Station), Ibadan on Saturday, 31 Jul, 1971

coffee cola control de enfermedades disease control ecologia ecologie ecology enfermedades de las plantas enfermedades fungosas fitomejoramiento fungal diseases insecta insecte nuisible maladie des plantes maladie fongique miridae pepiniere pest insects plant breeding plant diseases plant nurseries plantule pseudococcidae recherche research seed treatment seedlings traitement des semences tratamiento de semillas virose viroses virosis viveros