A study was conducted at
the greenhouse of the International Institute of Tropical Agriculture,
Ibadan, Nigeria to investigate the synergistic relationship of Xanthomonas campestris pv.
manihotis (causal agent of cassava bacterial blight CBB), and Colletotrichum gloeosporioides f.sp. manihotis (causal agent of cassava anthracnose
disease CAD), in cassava multiple infection. There were statistical
differences (P 0.05) in disease symptom expression among the cassava
genotypes following sequential inoculation of the pathogens and single
pathogen inoculation alone. The fastest occurrence and the highest overall
mean severity of the disease symptoms (necrotic lesion, shoot die-back,
gum exudate release and wilt symptoms) were observed in cassava genotypes
sequentially inoculated with bacterial, followed by the fungus one week
later (BFW) or in mixed combination prior to inoculation. Defoliation
was high in genotypes inoculated with bacterium first followed by the
fungus on the same day, with a low disease symptom expression in plants
inoculated with the fungus or bacterium alone.
C.N. Fokunang , A.G.O. Dixon and T. Ikotun , 2003. Synergistic Relationship of Bacterial Blight and Anthracnose Disease Pathogen in Cassava Multiple Infection. Journal of Biological Sciences, 3: 596-606.