Why does your Hydrangea macrophylla Magical Amore have white cottony spots? Diagnose the cause and fix it with our step-by-step guide.
These small, soft-bodied insects secrete a white, waxy, cottony substance to protect themselves as they feed on the sap of Hydrangea stems and leaf undersides. They often cluster in crevices or where leaves meet the stem.
Similar to mealybugs, these pests produce a white, fluffy coating that covers their bodies. They attach firmly to the woody stems of 'Magical Amore' and can cause leaf yellowing and stunted growth.
While usually appearing as a fine dust, severe infections can create patches that look like white felt or cotton on leaf surfaces. This fungal disease thrives in the humid, low-airflow environments often preferred by Hydrangeas.
The nymphs of these insects can produce small amounts of white, waxy secretions during feeding. This often results in distorted new growth and localized spotting on the foliage.
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