Basil Fungus

Basil Fungus

Basil (Ocimum basilicum), which is part of the mint family, has many fungal diseases. Many fungi causing them can lie dormant in the soil for years and then attack the plant under conditions favorable to them.

Fusarium Wilt:

  • Cause: Fusarium Oxysporum
  • Source: Acidic and sandy soil with warm weather.
  • Symptoms: Yellowing, wilting, asymmetric growth, curved leaves, pale pink-orange layers on stem. Seedlings die within 7 days of showing first symptom.

Black Spot:

  • Cause: Colletotrichum
  • Source: Warm humid nights and then cool nights.
  • Symptom: The leaves and stem end with round or irregular-shaped dark spots. Lesions with circular or irregular dark spots on leaves and stem. If the lesions are old, they start peeling. The lesions end up forming around the stem and chocking it, thus causing death of the plant.

Damping off and Root Rot:

  • Cause: Pythium ultimum and Phytophthora (micro organisms), other soil and seed borne fungi.
  • Source: Impure soil and water, un-sterilized pots and trays, using unclean gardening tools or planting already infected cuttings.
  • Symptoms: Seedlings grow poorly and the roots get infected and then rot.

Pythium root rot:

  • Cause: Resting spores in soil (which are transmitted by shore and sciarid flies).
  • Source: Wet and poorly drained soil.
  • Symptom : Stem of seedlings have slimy black lower parts which eventually collapse in one direction.

Phytophthora root rot:

  • Symptom: Root tips are attacked resulting in roots having brown to black rot.
       Maintaining healthy and hygienic conditions and growing Basil in modules or plug trays can avert chances of fungal attacks and ensure a healthy crop.

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Basil Fungus