Abstract:
Several cassava varieties are grown in Côte d’Ivoire. Some of them are
more widespread than others. Their dissemination depends on
characteristics such as yield, taste and dry matter content. Cassava
bacterial blight pressure constitutes a threat in all cassava agroecological zones. This study aims to survey the widely used varieties
and point out the zones where they were more susceptible. The survey
took into account the seven agro-ecological zones, the frequency of the
varieties presence, the severity index of the disease and the disease
incidence. The results showed that three varieties were predominately
recorded and are locally known as Akama, Yace and Yavo. Yace was
found in all agro-ecological zones. Akama and Yace were abundantly
found in the agro-ecological zone 1 and then the agro-ecological zone 4
whereas Yavo was abundantly cropped in the agro-ecological zone 4
and then in the agro-ecological zone 1. Yavo was found more
susceptible than Akama and Akama more susceptible than Yace to the
disease. The higher rates of severity index and disease incidence were
found in the agro-ecological zone 5 and agro-ecological zone 1 for
Yavo, the agro-ecological zone 6 and agro-ecological zone 4 for
Akama and the agro-ecological zone 6 and agro-ecological zone 1 for
Yace, Yace was disease free in the agro-ecological zone 4 and agroecological zone 5. Based on these results, it would be necessary to
investigate for an efficient control management in order to reduce yield
losses due to the high prevalence of Cassava bacterial blight.
