Rhododendron macabeanum · Shrub
Powdery mildew: Improve air circulation and avoid overhead watering; tolerate mild infections or apply fungicide if severe.
Bud blast: Remove and destroy infected buds promptly; ensure good drainage and avoid waterlogging.
Vine weevil: Apply nematode treatments in autumn or use biological controls; inspect potted plants regularly.
Silver leaf: Prune out infected branches well below the visible symptoms and destroy them immediately.
Rhododendron leafhopper: Encourage natural predators like ladybirds; use insecticidal soap for heavy infestations.