Pest identification
What's eating my arp rosemary?
Rosemary beetle (Chrysolina americana)
Signs: Metallic adults and grey larvae defoliate stems; most active in autumn and mild winter spells
Control: Inspect from August onward; shake plants over a tray and destroy beetles; pyrethrum spray for heavy infestations
Spittlebug / froghopper
Signs: Frothy white spit on stems in early summer; nymphs cause localised but minor wilting
Control: Blast off with water; no pesticide needed; remove dead plant material in autumn to reduce overwintering sites
Aphids
Signs: Light infestations on soft spring tips; rarely severe on mature woody rosemary
Control: Water jet or insecticidal soap; beneficial predators (lacewings, ladybirds) usually keep populations low
Keep arp rosemary pest-free
Healthy plants resist pests best. Get the basics right:
- What eats rosemary — the species this cultivar belongs to
- What eats arp rosemary — our other guide for the same plant
- What's wrong with my plant? — the diagnosis apps compared
- Common arp rosemary problems & fixes
- Arp Rosemary watering schedule
- Arp Rosemary light requirements
- Full arp rosemary care guide
Arp Rosemary pests — FAQ
What is eating my arp rosemary?
Arp rosemary, prized for cold-hardiness, shares the pest profile of all rosemary cultivars. Rosemary beetle is the key threat during its active autumn-to-spring season. Spittlebugs appear in early summer. Arp's woody vigour means it recovers well from pest pressure that might kill less robust varieties.
How do I get rid of rosemary beetle (chrysolina americana) on arp rosemary?
Metallic adults and grey larvae defoliate stems; most active in autumn and mild winter spells Inspect from August onward; shake plants over a tray and destroy beetles; pyrethrum spray for heavy infestations
How do I get rid of spittlebug / froghopper on arp rosemary?
Frothy white spit on stems in early summer; nymphs cause localised but minor wilting Blast off with water; no pesticide needed; remove dead plant material in autumn to reduce overwintering sites
How do I get rid of aphids on arp rosemary?
Light infestations on soft spring tips; rarely severe on mature woody rosemary Water jet or insecticidal soap; beneficial predators (lacewings, ladybirds) usually keep populations low