The fleshy galls begin as light green to pink thickened areas on the leaves and eventually turn chalky white as the spores are produced. The wind carries spores from diseased plants to others. Handpick and destroy distorted leaves when you first notice them, preferably before spores are produced. Avoid wetting the leaves when watering. Improve air circulation by selective pruning.
Fungicides are available.
Our expert's suggestions should not be construed as medical opinions aimed at establishing a diagnosis or course of treatment. Individuals under active treatment should not construe information contained in this column as replacing or superseding recommendations of their clinicians. Our expert's suggestions should not be construed as legal opinions aimed at determining a course of legal action.