Erica x darleyensis · Shrub
Root rot: Ensure excellent drainage by planting in gritty, acidic compost and avoid overwatering.
Budworm: Apply a systemic insecticide like dimethoate in early spring if infestation is severe.
Powdery mildew: Improve air circulation and spray with a fungicide containing myclobutanil if necessary.
Spider mites: Wash plants with water to dislodge mites or use a horticultural oil spray.
Nutrient deficiency: Apply ericaceous fertiliser in spring and avoid using lime-based soils or water.