Carpathian harebell is susceptible to aphids, which can cause yellowing and distortion of leaves. These pests can be controlled by introducing natural predators like ladybugs or by using insecticidal soap. Another common issue is powdery mildew, a fungal disease that appears as a white powdery substance on the leaves. To prevent powdery mildew, ensure good air circulation around the plant and avoid overhead watering. Root rot can also affect Carpathian harebell, typically caused by overwatering or poorly drained soil. To prevent root rot, plant in well-draining soil and avoid excessive watering. Lastly, spider mites can infest Carpathian harebell, causing stippling and webbing on the leaves. These pests can be controlled with insecticidal soap or neem oil.
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