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Journal of Biological Sciences

Year: 2004 | Volume: 4 | Issue: 4 | Page No.: 423-430
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Authors

C.N. Fokunang

A.G.O. Dixon

T. Ikotun

Keywords

Research Article

Survival and Over-seasoning of Colletotrichum gloeosporioides F. sp. Manihotis, on Post-harvest Cassava (Manihot esculenta Crantz) Plant Materials and Soils

C.N. Fokunang, A.G.O. Dixon and T. Ikotun
The aim of this study was to establish the importance of post-harvest survival and over-seasoning of Colletotrichum gloeosporioides f.sp. manihotis on planting materials and in soil. Infected stem cuttings from twelve cassava clones, harvested from two plot sites ES 24 and BSI, then incubated at 25 ± 2 ° for 8 months showed a significant decrease (P=0.05) in fungal survival amongst cassava clones. The lowest fungal recovery of 15% after 8 months incubation was recorded for cassava clones 88/0002336 and 30572. Cassava stakes, stored under shade and high relative humid conditions for 16 months showed a gradual monthly decrease in fungal survival, up to the 10th month. A gradual increase in fungal recovery was recorded from the 11th month up to the 16th month when maximum recovery was attained, due to re-infectivity of newly developed twigs by CAD pathogens from parent plants. Survival of fungus on soil gradually reduced with time and at the 6th month of sampling, there was no recovery recorded for 80% of the field plot sites. Burial of infected materials for 150 days below 30 cm depth significantly reduced the survival of C. gloeosporioides f.sp. manihotis on infected materials. These studies have shown that C. gloeosporioides f.sp. manihotis could survive on infected cuttings for more than 8 months, but less likely to survive in soil for more than 4 months.
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