Pest identification
What's eating my yakushima rhododendron?
Vine weevil (Otiorhynchus sulcatus)
Signs: Characteristic notched leaf edges from adults; white grubs devastate roots in pots, causing sudden collapse
Control: Nematode drench with Steinernema kraussei in late summer; change container compost annually and inspect for grubs
Rhododendron leafhopper (Graphocephala fennahi)
Signs: Pale stippling on leaves; transmits bud blast fungus that turns flower buds black and bristly
Control: Remove blasted buds immediately; pyrethrin spray in late summer to reduce adults before egg-laying in buds
Rhododendron lace bug (Stephanitis rhododendri)
Signs: Yellowy mottled upper leaf surface; brown resinous spots on undersides where nymphs feed
Control: Spray undersides with insecticidal soap or neem oil; site plant in partial shade as lace bugs prefer sunny positions
Keep yakushima rhododendron pest-free
Healthy plants resist pests best. Get the basics right:
Yakushima Rhododendron pests — FAQ
What is eating my yakushima rhododendron?
Yakushima Rhododendron faces vine weevil as the most serious pest, especially as it is frequently grown in containers. Rhododendron leafhopper vectors bud blast disease. Lace bugs bleach foliage in dry, sunny positions. As a compact alpine-origin species often in sheltered gardens, deer damage is less common but vine weevil vigilance is essential.
How do I get rid of vine weevil (otiorhynchus sulcatus) on yakushima rhododendron?
Characteristic notched leaf edges from adults; white grubs devastate roots in pots, causing sudden collapse Nematode drench with Steinernema kraussei in late summer; change container compost annually and inspect for grubs
How do I get rid of rhododendron leafhopper (graphocephala fennahi) on yakushima rhododendron?
Pale stippling on leaves; transmits bud blast fungus that turns flower buds black and bristly Remove blasted buds immediately; pyrethrin spray in late summer to reduce adults before egg-laying in buds
How do I get rid of rhododendron lace bug (stephanitis rhododendri) on yakushima rhododendron?
Yellowy mottled upper leaf surface; brown resinous spots on undersides where nymphs feed Spray undersides with insecticidal soap or neem oil; site plant in partial shade as lace bugs prefer sunny positions