Rhododendron hanceanum · Shrub
Powdery mildew: Improve air circulation and avoid overhead watering; tolerate mild infections or apply a fungicide if severe.
Rhododendron bud blast: Remove and destroy infected buds promptly; site plants in sheltered locations away from frost pockets.
Vine weevil: Use nematode treatments in autumn or apply biological controls to soil; inspect potted plants regularly.
Silver leaf: Prune out and burn affected branches well below the infection site; avoid planting near infected trees.
Phytophthora root rot: Ensure well-drained, acidic soil; avoid overwatering and do not plant in heavy clay without improvement.