Rhododendron argyrophyllum · Shrub
Vine weevil: Check pots for grubs before planting and use biological nematodes or approved insecticides if infested.
Powdery mildew: Improve air circulation and apply a fungicide if severe, though leaf removal is not recommended.
Silver leaf: Prune out infected branches well below the visible symptoms and destroy them immediately.
Bud blast: Remove and destroy infected buds promptly if practical to reduce spore spread.
Pieris lacebug: Encourage natural predators or treat with a systemic insecticide if populations are high.