Prevalence and Severity of Nattrassia mangiferae Root and Stem Rot Pathogen of Cassava in Bénin

Plant Disease
W MsikitaR Fagbemissi

Abstract

Root rot pathogens were found through diagnostic surveys in all departments (regions) of Bénin, West Africa, to affect 86 to 100% and 96 to 100% of cassava fields during the dry and rainy seasons, respectively. Disease incidence in individual fields ranged between 0 and 53%, and averaged 16 to 27% per department. Nattrassia mangiferae was consistently the most frequently isolated root rot pathogen (56% in the dry season and 22 to 52% in the rainy season). Pathogenicity of N. mangiferae was confirmed on four cultivars of cassava using stem cuttings and storage roots. For all four cultivars, N. mangiferae significantly reduced the number of roots. Lesions (3 to 15 cm long) formed on the lower stem portion of all inoculated plants, whereas control plants remained symptom free. On storage roots, the disease profile was similar to that formed on stem cuttings. Other root rot pathogens detected during the dry season were Macrophomina phaseolina (14.2%), Fusarium spp. (11.8%), Botryodiplodia theobromae (7.7%), and Pythium spp. (2.9%). During the rainy season, Fusarium spp. were the second most commonly isolated root rot pathogens in three departments (Atlantique, Borgou, and Mono). In Oueme and Zou, B. theobromae was the second most i...Continue Reading

References

Feb 1, 1988·Journal of Medical and Veterinary Mycology : Bi-monthly Publication of the International Society for Human and Animal Mycology·M K Moore
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May 1, 1954·American Journal of Public Health and the Nation's Health·E R JACKSON
Feb 18, 2004·Journal of Cataract and Refractive Surgery·Mahmood JabbarvandAli Amini

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Citations

Oct 24, 2008·Phytopathology·Ranajit BandyopadhyayJohn F Leslie
Nov 1, 2007·Plant Disease·W MsikitaB D James

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