Rhododendron decorum · Shrub
Powdery mildew: Tolerate unless severe; avoid fungicides to protect biodiversity and do not remove leaves.
Bud blast: Remove and destroy infected flower buds promptly if practical for the plant size.
Vine weevil: Use biological nematodes in soil or physical barriers to control larvae and adults.
Silver leaf: Prune out infected wood well below the visible symptoms and destroy it immediately.
Rhododendron leafhopper: Encourage natural predators like ladybirds; severe cases may require targeted insecticide.