| Potato wart: Synchytrium endobioticum |
Symptom:
- As small white granular swellings on the eyes
- Remain minute or may become as large as the tuber
- Soft, pulpy, white to begin & become black later
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Granular swellings |
Outgrowth from eyes |
infected plant |
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Identification of pathogen:
- Do not develop any mycelium
- Produce summer sporangia – thin walled
- Sporangia release zoospores which attack the tubers
Mode of spread and survival:
- Resting spores - viable in soil for 20-25 yrs
- Withstand passage through the intestines of cattle
- Spread - contaminated manure, soil, infected seed tubers
Epidemiology:
- Temp - 16.7 to 17.8°C
- Presence of oxygen and nitrates in soil favours the germination of sporangia
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Management:
- Resistant cultivars - Kufri Kanchar, Kufri Sherpa, Kufri Jyoti
- Steam sterilization of soil
- Soil treatment – mercuric chloride and formalin 5%
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Source of Images:
http://fera.co.uk/plantClinic/documents/factsheets/pwd.pdf
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