Pest identification
What's eating my narrow-leaf zinnia?
Spider mites
Signs: Fine stippling on leaves, bronze or silver cast, fine webbing on undersides during hot dry weather.
Control: Blast plants with a strong jet of water to knock mites off; apply insecticidal soap or neem oil spray every 5–7 days. Improve air circulation and keep soil evenly moist.
Aphids
Signs: Clusters of soft-bodied insects on shoot tips and buds; sticky honeydew residue and distorted new growth.
Control: Knock off with a strong water spray. Spray persistent infestations with insecticidal soap. Encourage ladybirds and lacewings by planting nearby nectar plants.
Caterpillars (budworms / loopers)
Signs: Ragged holes chewed in petals and leaves; flower buds hollowed before they open.
Control: Hand-pick caterpillars at dusk. Apply Bacillus thuringiensis (Bt) spray to foliage as a targeted, safe biological control.
Keep narrow-leaf zinnia pest-free
Healthy plants resist pests best. Get the basics right:
Narrow-leaf Zinnia pests — FAQ
What is eating my narrow-leaf zinnia?
Narrow-leaf zinnia (Zinnia angustifolia) is far more resistant to pests and disease than common zinnias, but spider mites, aphids, and caterpillars can still move in during hot, dry spells. Its compact foliage discourages slugs. Inspect leaf undersides weekly and act early — this species bounces back quickly when problems are caught fast.
How do I get rid of spider mites on narrow-leaf zinnia?
Fine stippling on leaves, bronze or silver cast, fine webbing on undersides during hot dry weather. Blast plants with a strong jet of water to knock mites off; apply insecticidal soap or neem oil spray every 5–7 days. Improve air circulation and keep soil evenly moist.
How do I get rid of aphids on narrow-leaf zinnia?
Clusters of soft-bodied insects on shoot tips and buds; sticky honeydew residue and distorted new growth. Knock off with a strong water spray. Spray persistent infestations with insecticidal soap. Encourage ladybirds and lacewings by planting nearby nectar plants.
How do I get rid of caterpillars (budworms / loopers) on narrow-leaf zinnia?
Ragged holes chewed in petals and leaves; flower buds hollowed before they open. Hand-pick caterpillars at dusk. Apply Bacillus thuringiensis (Bt) spray to foliage as a targeted, safe biological control.