Magnolia Leaf Blisters: Fungal Cause and Organic Treatment

Magnolia Leaf Blisters: Fungal Cause and Organic Treatment

Hollow, wart-like blisters on magnolia leaves that distort foliage are caused by a fungal pathogen (likely Exobasidium or similar). The fungus infects young leaves in spring, causing galls that later dry and release spores.

Organic Management

Atomic Grow cleanses leaf surfaces, disrupts fungal sporulation, and enhances the magnolia's natural resistance. Apply as a foliar spray every 7-10 days during leaf emergence and early expansion.

Cultural Practices

• Rake and destroy all fallen leaves in autumn.
• Improve air circulation with selective pruning.
• Avoid overhead irrigation during wet springs.

Conventional fungicides (chlorothalonil) are also effective if applied preventively at bud break.