Fusarium Wilt of Sweet Potato Caused by Fusarium oxysporum f.sp. batatas in Egypt | ||
| Egyptian Journal of Phytopathology | ||
| Article 2, Volume 46, Issue 1, June 2018, Pages 21-35 PDF (641.94 K) | ||
| Document Type: Original Article | ||
| DOI: 10.21608/ejp.2018.87431 | ||
| Authors | ||
| Thanaa Mousa* 1; Farag Farag2; Hanaa Armanious1; Afaf Salem3; Anwar Galal1 | ||
| 1Plant Pathol. Dept., Fac. Agric., Minia Univ., Egypt | ||
| 2Plant Pathology Research Institute, ARC, Giza, Egypt | ||
| 3Horticultural Research Institute, ARC, Giza, Egypt | ||
| Abstract | ||
| Fusarium wilt in sweet potato was first observed in Middle Egypt governorates, i.e., Beni Sweif and Minia, between early April to September 2016. Disease symptoms started as a stunted growth, yellowing and wilting of the leaves, browning and discolouration of the xylem vessels. Koch’s postulates were fulfilled and all Fusarium oxysporum isolates tested were able to infect sweet potato plants causing typical wilt symptoms. Prevalence, incidence and severity of sweet potato wilt (SPW) were varied with districts examined. Fungi belonging to five generae.g., Alternaria, Ceratocystis, Fusarium, Macrophomina and Rhizoctonia were found to be associated with wilted sweet potato plants. Fusarium spp recorded the highest frequency (80.6%) and Fusarium oxysporum showed 51.5%. frequency. Sweet potato genotypes were varied in their response to infection by Fusarium oxysporum isolate F1. Genotypes Menoufia 6 and Menoufia 2 reacted as resistant, while Local A and Line 26 were highly susceptible. Fusarium oxysporum f.sp. batatas isolate F1 was infective to convolvulaceous plants such as Cairo morning glory and field bindweed but was not pathogenic to non convolvulaceous plants such as alfalfa, carrot, cotton, potato, sugar beet, sugarcane, turnip and wheat. Chlorophyll degradation was ralated to sweet potato genotypes reaction towards Fusarium oxysporum f.sp. batatas infection. Least degradation values were found in resistant genotypes and vice versa exhibited by susceptible genotypes. In contrast, phenols were enhanced when Fusarium oxysporum f.sp. batatas infected the resistant genotypes and decreased in the susceptible genotypes compared with uninfected. | ||
| Keywords | ||
| Chlorophyll a; b, Fusarium oxysporum f.sp. batatas, host range, phenols, sweet potato genotypes, sweet potato wilt | ||
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