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Journal of Biological Sciences

Year: 2003 | Volume: 3 | Issue: 6 | Page No.: 596-606
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Research Article

Synergistic Relationship of Bacterial Blight and Anthracnose Disease Pathogen in Cassava Multiple Infection

C.N. Fokunang, A.G.O. Dixon and T. Ikotun

ABSTRACT

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.
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