Pest identification
What's eating my common evening primrose?
Moth caterpillars (incl. Hyles lineata, Schinia florida)
Signs: Leaf tissue eaten from the margins or flower buds consumed by primrose moth larvae feeding directly in the bloom.
Control: Hand-pick visible caterpillars; apply Bacillus thuringiensis (Bt) spray for large infestations; tolerate minor damage as many are specialist native feeders.
Flea beetles (Altica fuscouenea)
Signs: Numerous small, round holes peppered across leaves, most noticeable on young foliage in spring.
Control: Protect seedlings with fleece or row covers in spring; diatomaceous earth around the base deters adults; established plants recover without treatment.
Japanese beetle (Popillia japonica)
Signs: Skeletonised flowers and foliage in midsummer; beetles congregate and feed in groups.
Control: Hand-pick in the morning when beetles are sluggish; knock into soapy water; neem oil spray as a deterrent; avoid mass pheromone traps near the plant.
Keep common evening primrose pest-free
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Common Evening Primrose pests — FAQ
What is eating my common evening primrose?
Common Evening Primrose (Oenothera biennis) is generally pest-resistant but hosts specialist feeders. Caterpillars of several moths eat the foliage, flea beetles chew small holes in leaves, and Japanese beetles may devour flowers in midsummer. Deer and rabbits will browse the rosette leaves. The plant usually outgrows light insect damage without any intervention needed.
How do I get rid of moth caterpillars (incl. hyles lineata, schinia florida) on common evening primrose?
Leaf tissue eaten from the margins or flower buds consumed by primrose moth larvae feeding directly in the bloom. Hand-pick visible caterpillars; apply Bacillus thuringiensis (Bt) spray for large infestations; tolerate minor damage as many are specialist native feeders.
How do I get rid of flea beetles (altica fuscouenea) on common evening primrose?
Numerous small, round holes peppered across leaves, most noticeable on young foliage in spring. Protect seedlings with fleece or row covers in spring; diatomaceous earth around the base deters adults; established plants recover without treatment.
How do I get rid of japanese beetle (popillia japonica) on common evening primrose?
Skeletonised flowers and foliage in midsummer; beetles congregate and feed in groups. Hand-pick in the morning when beetles are sluggish; knock into soapy water; neem oil spray as a deterrent; avoid mass pheromone traps near the plant.