Sclerotial blight

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Causal organism: Sclerotium rolfsii Sacc. (anamorph), Corticium rolfsii Curzi (teleomorph)

 

Other names: stem rot, southern blight, bed rot, cottony rot, Sclerotium wilt, collar rot, crown rot, fire fang root rot, foot rot, southern wilt

 

Severely infected plant after stems are girdled by Sclerotium rolfsii (C. Clark, APS).

 

An infected plant showing yellowing of lower leaves and  characteristic white fan-like structure (C. Clark, APS).

Diagnostic summary

  • What you see on plants

- usually appears as isolated patches in plant beds.

 

- in the field, appears when plant canopy has fully covered the soil surface.

 

- affect plants at or below the soil surface.

 

- initially, there is yellowing of lower leaves and wilting.

 

- depressed, water soaked, sunken lesions in stem,  which at later stage, are covered with a white fan-like mycelium. Soon after, the stem is girdled and the plant eventually dies.

 

  • Favours hot weather condition and prefers high temperatures (28-30°C).

Taxonomy

Economic importance

Geographical distribution

Morphology

Symptoms

Biology and ecology

Host range

Inspection and diagnosis

Management

References

 

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