Pest identification
What's eating my florence fennel?
Aphids
Signs: Clusters of soft insects on stems and new growth; sticky honeydew residue, distorted shoot tips
Control: Blast off with a strong jet of water; apply insecticidal soap or neem oil spray; encourage ladybirds and lacewings
Swallowtail / Anise caterpillars (Papilio polyxenes)
Signs: Large sections of foliage stripped by boldly striped green-and-black caterpillars
Control: Hand-pick caterpillars (they are beneficial pollinators as adults); apply Bacillus thuringiensis (Bt) only if infestation is severe
Slugs & Snails
Signs: Ragged holes in leaves and stems, especially seedlings; slime trails on soil and foliage
Control: Use copper tape around beds, set beer traps, apply iron phosphate pellets (pet-safe); hand-pick at night
Aphid-tended Ants
Signs: Ants farm aphid colonies, protecting them from predators and worsening infestations
Control: Apply sticky barrier bands to plant bases; address the aphid colony directly to break the cycle
Keep florence fennel pest-free
Healthy plants resist pests best. Get the basics right:
Florence Fennel pests — FAQ
What is eating my florence fennel?
Florence fennel is targeted by aphids, caterpillars (especially swallowtail larvae), and slugs. Aphids are the most persistent threat, clustering on young growth and stems. Deer and rabbits will browse the feathery foliage if garden-grown. Regular inspection and prompt action keeps harvests intact.
How do I get rid of aphids on florence fennel?
Clusters of soft insects on stems and new growth; sticky honeydew residue, distorted shoot tips Blast off with a strong jet of water; apply insecticidal soap or neem oil spray; encourage ladybirds and lacewings
How do I get rid of swallowtail / anise caterpillars (papilio polyxenes) on florence fennel?
Large sections of foliage stripped by boldly striped green-and-black caterpillars Hand-pick caterpillars (they are beneficial pollinators as adults); apply Bacillus thuringiensis (Bt) only if infestation is severe
How do I get rid of slugs & snails on florence fennel?
Ragged holes in leaves and stems, especially seedlings; slime trails on soil and foliage Use copper tape around beds, set beer traps, apply iron phosphate pellets (pet-safe); hand-pick at night
How do I get rid of aphid-tended ants on florence fennel?
Ants farm aphid colonies, protecting them from predators and worsening infestations Apply sticky barrier bands to plant bases; address the aphid colony directly to break the cycle