Supporting agricultural innovation in two districts of western Hararghe : the role of research, extension and farmers / Adugna Wakjira ... [et al.]Integrating biological control and host plant resistance : proceedings of a CTA/IAR/IIBC seminar = Intégration de la résistance des plantes et de la lutte biologique : actes d'un séminaire CTA/IAR/IIBC : Addis Ababa, Ethiopia, 9-14 October 1995Integrating biological control and host plant resistance : summary report and recommendations of a CTA/IAR/IIBC seminar : Addis Ababa, Ethiopia, 9-14 October 1995