Ghana Over two decades of application of induced mutation techniques toward crop improvement in Ghana have led to the production of improved mutant varieties in two crops. In cassava ( Manihot esculenta Crantz), irradiation of stem cuttings using gamma irradiation resulted in the production of “Tek bankye,’ a mutant variety with high dry matter content (40%) and good poundability from the parental line, which was a segregant of a hybrid between the Nigerian landrace Isunikaniyan (ISU) and the breeder’s line TMS4(2)1425, both from IITA, Nigeria. Similarly, irradiation of vegetative buds of ‘Amelonado’ (P30), ‘Trinitario’ (K.5), and ‘Upper Amazon’ (T85/799) cocoa varieties resulted in the production of a mutant variety resistant to the Cocoa Swollen Shoot Virus (CSSV). Multilocation on-farm trials of the mutant line indicate significant increases in yield for farmers, without symptoms of the disease [37]