(Cercosporidium henningsii)
Credits: Biovision-Infonet
(c) A.A.Seif, icipe
Symptoms are restricted to older leaves. Brownish round spots with definite borders appear on the upper leaf surface.
On the lower leaf surface, they are brownish-grey in colour. Infected leaves later become yellow and eventually drop. In wet areas the disease may cause a yield reduction of up to 20%.
What to do:
- Though the disease is widespread in most cassava growing countries, it is not an economically important disease problem and it does not warrant any intervention.