Pest identification
What's eating my equisetum japonicum?
Slugs and snails
Signs: Collapsed or chewed young shoots in spring before stems harden
Control: Iron phosphate pellets in spring; grit mulch around crown; hand-pick at dusk
Caterpillars
Signs: Chewed sections of soft emerging stems; older silica-hardened stems are unappealing to most larvae
Control: Hand-remove larvae; Bt spray as a targeted biological option on young growth
Aphids
Signs: Small colonies on tender new shoots; honeydew and minor growth distortion
Control: Strong water jet to dislodge; insecticidal soap spray; rarely requires repeated treatment
Keep equisetum japonicum pest-free
Healthy plants resist pests best. Get the basics right:
Equisetum japonicum pests — FAQ
What is eating my equisetum japonicum?
Japanese horsetail shares the silica-rich stems of other Equisetum species, making it largely resistant to chewing pests. Slugs are the most realistic threat to emerging spring shoots before they toughen. Caterpillars occasionally damage soft stems, and aphids may visit tender new growth but rarely cause serious harm.
How do I get rid of slugs and snails on equisetum japonicum?
Collapsed or chewed young shoots in spring before stems harden Iron phosphate pellets in spring; grit mulch around crown; hand-pick at dusk
How do I get rid of caterpillars on equisetum japonicum?
Chewed sections of soft emerging stems; older silica-hardened stems are unappealing to most larvae Hand-remove larvae; Bt spray as a targeted biological option on young growth
How do I get rid of aphids on equisetum japonicum?
Small colonies on tender new shoots; honeydew and minor growth distortion Strong water jet to dislodge; insecticidal soap spray; rarely requires repeated treatment