Peach scab

Cladosporium carpophilum

Cladosporium carpophilum (Peach Scab):

Appearance: Cladosporium carpophilum causes peach scab, which manifests as dark, scaly lesions on the fruit surface. These lesions can affect both the skin and the flesh of the peach, leading to a reduction in fruit quality. The scab lesions often have a rough or scaly texture, and severe infections can result in distortion and cracking of the fruit.

Identification:

  1. Scaly Lesions on Fruit: Look for dark, scaly lesions on the surface of peach fruit. These lesions may be rough to the touch.
  2. Distortion and Cracking: Severe infections may cause distortion and cracking of the fruit.
  3. Lesions on Leaves and Twigs: In addition to affecting fruit, peach scab can also cause lesions on leaves and twigs, further compromising the overall health of the tree.

Management:

  1. Fungicide Application:

    • Fungicidal Sprays: Application of fungicides, especially those effective against Cladosporium carpophilum, can be a key component of managing peach scab. Fungicide choice and application timing should align with local recommendations and conditions.

  2. Cultural Practices:

    • Pruning: Prune trees to improve air circulation and reduce humidity, creating less favorable conditions for the fungus.
    • Leaf Removal: Remove and dispose of infected leaves and debris to reduce the inoculum source.

  3. Resistant Varieties:

    • Plant Resistant Peach Varieties: Utilize peach varieties that are bred for resistance or tolerance to peach scab.

  4. Sanitation:

    • Clean Orchards: Maintain clean orchards by removing fallen leaves and debris.
    • Prune Infected Branches: Prune and remove branches with severe infections.

  5. Regular Monitoring:

    • Scouting for Symptoms: Regularly monitor peach trees for early symptoms of peach scab, especially during conditions conducive to disease development.