Pest identification
What's eating my knautia macedonica?
Aphids
Signs: Colonies of soft-bodied insects on shoot tips and flower buds; sticky honeydew and distorted growth.
Control: Blast off with a strong jet of water; encourage ladybirds and lacewings. Use insecticidal soap or neem oil spray for heavy infestations.
Slugs and snails
Signs: Ragged, irregular holes in young basal leaves in spring; slime trails present.
Control: Apply wildlife-safe slug pellets (ferric phosphate) around the crown in spring; hand-pick after dark; use copper tape on containers.
Caterpillars
Signs: Chewed leaf margins and occasionally stripped stems from noctuid moth larvae in summer.
Control: Hand-pick larvae; apply Bacillus thuringiensis (Bt) spray for larger infestations on multiple plants.
Keep knautia macedonica pest-free
Healthy plants resist pests best. Get the basics right:
Knautia macedonica pests — FAQ
What is eating my knautia macedonica?
Knautia macedonica is troubled mainly by aphids clustering on soft new growth and flower stems, and by powdery mildew in dry summers. Slugs and snails graze young foliage in spring. It is largely ignored by deer and rabbits, making it a reliably tough border perennial.
How do I get rid of aphids on knautia macedonica?
Colonies of soft-bodied insects on shoot tips and flower buds; sticky honeydew and distorted growth. Blast off with a strong jet of water; encourage ladybirds and lacewings. Use insecticidal soap or neem oil spray for heavy infestations.
How do I get rid of slugs and snails on knautia macedonica?
Ragged, irregular holes in young basal leaves in spring; slime trails present. Apply wildlife-safe slug pellets (ferric phosphate) around the crown in spring; hand-pick after dark; use copper tape on containers.
How do I get rid of caterpillars on knautia macedonica?
Chewed leaf margins and occasionally stripped stems from noctuid moth larvae in summer. Hand-pick larvae; apply Bacillus thuringiensis (Bt) spray for larger infestations on multiple plants.