Pest identification
What's eating my polystichum setiferum 'divisilobum'?
Slugs and snails
Signs: Chewed and tattered young fronds emerging from the crown; slime trails across foliage.
Control: Apply ferric phosphate pellets early in spring before croziers unfurl; use wool pellets around the crown as a physical barrier.
Vine weevil
Signs: Notched frond margins (adults); grubs destroy root system causing sudden wilting.
Control: Drench containers with Steinernema kraussei nematodes in spring; inspect root ball when repotting and remove any white grubs by hand.
Aphids
Signs: Colonies on young frond stems causing distorted growth; sticky honeydew on leaves.
Control: Blast off with water; apply insecticidal soap or neem oil; encourage natural predators in the garden.
Keep polystichum setiferum 'divisilobum' pest-free
Healthy plants resist pests best. Get the basics right:
- What eats soft shield fern — the species this cultivar belongs to
- What's wrong with my plant? — the diagnosis apps compared
- Common polystichum setiferum 'divisilobum' problems & fixes
- Polystichum setiferum 'Divisilobum' watering schedule
- Polystichum setiferum 'Divisilobum' light requirements
- Full polystichum setiferum 'divisilobum' care guide
Polystichum setiferum 'Divisilobum' pests — FAQ
What is eating my polystichum setiferum 'divisilobum'?
Polystichum setiferum 'Divisilobum' (soft shield fern) is a garden evergreen fern. Slugs and snails are the primary pest, chewing soft new croziers each spring. Vine weevil can damage roots in containers. This fern is generally resilient; mature leathery fronds deter most insect feeders and it is largely ignored by deer.
How do I get rid of slugs and snails on polystichum setiferum 'divisilobum'?
Chewed and tattered young fronds emerging from the crown; slime trails across foliage. Apply ferric phosphate pellets early in spring before croziers unfurl; use wool pellets around the crown as a physical barrier.
How do I get rid of vine weevil on polystichum setiferum 'divisilobum'?
Notched frond margins (adults); grubs destroy root system causing sudden wilting. Drench containers with Steinernema kraussei nematodes in spring; inspect root ball when repotting and remove any white grubs by hand.
How do I get rid of aphids on polystichum setiferum 'divisilobum'?
Colonies on young frond stems causing distorted growth; sticky honeydew on leaves. Blast off with water; apply insecticidal soap or neem oil; encourage natural predators in the garden.