Pathogenicite in vivo en inoculations artificielles d’isolats de Mycosphaerella spp. des differentes zones de production de bananiers de la Cote d’ivoire

Abstract

Parasitism in bananas and plantain has been studied in Côte d’Ivoire. Sigatoka disease (Mycosphaerella musicola) and black leaf streak disease  (Mycosphaerella fijiensis) were both present in all regions with a dominance of black leaf streak disease. Sigatoka disease symptoms were seen only  on cultivar Figue Sucrée partially resistant to black leaf streak disease. The susceptibility of plantain cultivar Corne 1 to black leaf streak disease  varied from East to West. Hybrids were highly resistant to black leaf streak disease than reference cultivars Grand Naine and Orishele. They kept  half of their leaves from flowering to harvest. In inoculation of cultivar «Grande Naine», isolates of M. fijiensis were separated into three groups  according to their virulence. Inoculated hybrids were resistant with delay of symptoms development ranging from 40 to 72 days while reference  cultivars showed delay of 25 to 38 days only.