Pink rot

Phytophthora erythroseptica

Phytophthora erythroseptica:

Phytophthora erythroseptica is a water mold (oomycete) pathogen that causes pink rot, a destructive disease affecting potato tubers. This pathogen is known for its ability to cause significant post-harvest losses during storage. Here's an informative description of Phytophthora erythroseptica, including its appearance, identification, and management:

Appearance:

Tuber Symptoms:

  1. Pink Coloration: Affected potato tubers exhibit a distinctive pink discoloration, particularly near the eyes and lenticels.
  2. Soft Rot: The infected tissue becomes soft and watery, leading to a breakdown of the tuber's structural integrity.

Identification:

  1. Pink Discoloration: Identify potato tubers showing a pink coloration, especially in areas around the eyes and lenticels.
  2. Soft Rot: Observe for symptoms of soft rot, which may include a mushy texture and an unpleasant odor.

Management:

  1. Preventive Measures:

    • Quality Harvest: Handle potatoes carefully during harvest to minimize bruising and wounds that can provide entry points for the pathogen.
    • Avoid Over-Irrigation: Maintain proper soil moisture levels to prevent conditions conducive to the development of Phytophthora erythroseptica.

  2. Post-Harvest Management:

    • Proper Storage: Store potatoes in well-ventilated and cool conditions to slow down the development of the pathogen.
    • Regular Monitoring: Periodically inspect stored potatoes for signs of pink rot, discarding any infected tubers promptly.

  3. Fungicide Application:

    • Post-Harvest Fungicides: Application of post-harvest fungicides may be considered to control the development of Phytophthora erythroseptica during storage. Consult with agricultural experts for recommended fungicides and application schedules.

  4. Sanitation:

    • Clean Storage Facilities: Thoroughly clean storage facilities between harvests to reduce the risk of pathogen contamination.
    • Discard Infected Tubers: Promptly discard any potatoes showing symptoms of pink rot to prevent the spread of the disease within storage.

  5. Resistant Varieties:

    • Plant Resistant Potato Varieties: Whenever possible, plant potato varieties that are resistant or less susceptible to Phytophthora erythroseptica.

  6. Crop Rotation:

    • Rotate Crops: Implement a crop rotation strategy to reduce the buildup of the pathogen in the soil.

  7. Research and Surveillance:

    • Research on Control Measures: Support and engage in research to identify and develop effective control measures for pink rot.
    • Surveillance: Regularly monitor potato crops and storage facilities for early signs of the disease.