| Sclerotium rot: Sclerotium rolfsii |
Symptom:
- Thick white strands of fungus appear at the collar region of the stem and roots
- White fungal hyphae grow on the tubers which later start rotting and covered by fruiting bodies
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Initial white fungal growth |
Fungal mycelium |
infected plant |
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Identification of pathogen:
- Fungi produced silky white mycelium
- Septate and branched hyphae
- Globose, smooth surfaced sclerotia
Mode of spread and survival:
- Mycelium and sclerotia subsists in soil
- Infected soil, in running water & on farm implements
Epidemiology:
- Temp - 30-35°C
- Thrives in sandy or loamy soil which are acidic
- Alternate wet & dry soil conditions favour the disease development
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Management:
- Application of ammonium nitrate to the soil
- Seed tuber treatment - PCNB@ 15 kg/ha
- Resistant clones - S. acaule, S. multiinerruptum, S. infundibuliformae
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Source of Images:
Mejda Daami-Remadi, Hayfa Jabnoun-Khiareddine, Fakher Ayed, Khaled Hiba, and Mohamed El Mahjoub.2007.First Report of Sclerotium rolfsii Causing Atypical Soft Rot on
Potato Tubers in Tunisia.Tunisian Journal of Plant Protection, 2 (1),pp-59-62.
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