Domakihub How to Get Rid of Rosemary Beetle Fast
Stop these striking but destructive pests from stripping your herbs bare.
Reviewed by Domakihub home & decor pros · 2026-06-23 · 4 min read
Rosemary beetles (Chrysolina americana) are metallic green-and-purple striped insects native to southern Europe, which makes them a familiar sight in Greek gardens, terraces, and hotel courtyards. Despite their attractive appearance they can defoliate rosemary, lavender, and thyme plants surprisingly quickly if left unchecked. The video above demonstrates what to look for; the steps below walk you through exactly how to remove them for good.
What Is the Rosemary Beetle?
Chrysolina americana is a small beetle, roughly 6-8 mm long, with metallic purple and green stripes that can look almost jewel-like. Despite its scientific name suggesting an American origin, it is native to southern Europe and the Mediterranean basin, meaning Greek properties are squarely in its natural range.
Adults overwinter in the soil and emerge from late summer onwards. They feed on the foliage of aromatic plants — rosemary, lavender, thyme, and sage — and lay eggs on stems. Larvae then hatch and continue feeding through autumn and winter, sometimes causing more damage than the adults themselves.
Why It Matters for Homes and Rentals in Greece
Aromatic herbs are a staple of Greek gardens, holiday villa terraces, and hotel courtyards — both for aesthetics and as a practical kitchen garden resource. A severe rosemary beetle infestation can strip plants of all foliage, leaving bare, woody stems that take a full growing season to recover. For rental properties where a well-maintained garden is part of the guest experience, catching an outbreak early matters.
Fortunately, the beetle has no significant natural resistance to the control methods below, and most infestations can be cleared in a single focused session without the use of chemical sprays.
5 Steps to Get Rid of Rosemary Beetle
- 1
Inspect plants early and often
Start by checking your rosemary, lavender, thyme, and sage plants weekly from late August through spring. Look on the upper and lower surfaces of leaves and along young stems for the distinctive metallic-striped adults and for the grey-green larvae, which are slightly smaller and harder to spot. Early detection prevents a handful of insects from becoming a full colony.
- 2
Hand-pick adults and larvae
Spread an old sheet or newspaper under the plant, then shake the stems firmly. Adults and larvae will drop off readily. Collect them from the sheet and drop them into a bucket of soapy water to kill them. Repeat this process every few days during peak activity (autumn and early spring) until you stop finding new insects. This is the single most effective and least disruptive method.
- 3
Remove and destroy heavily infested material
If a section of stem is covered in eggs or larvae, prune it back cleanly with sterilised secateurs and dispose of the cutting in a sealed bag — do not compost it, as eggs and larvae can survive. This is quicker than picking insects off stem by stem and also rejuvenates older, woody herb plants.
- 4
Cultivate the soil around the base of the plant
Rosemary beetles pupate in the top layer of soil beneath the host plant. In late spring, gently fork over or hoe the soil around the base to expose pupae to birds and to sun, which kills them. Avoid digging deeply enough to damage roots. Doing this for two or three consecutive springs significantly reduces adult numbers the following season.
- 5
Apply an appropriate pesticide only as a last resort
If hand-picking has not brought an infestation under control, a pyrethrin-based contact insecticide labelled for ornamental plants can be applied in the evening to reduce harm to pollinators. Always read the label and observe the pre-harvest interval if the plant is also used for cooking. Avoid broad-spectrum sprays on flowering herbs, particularly lavender, which are critical foraging plants for bees.
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FAQ
- Can rosemary beetles kill my plant entirely?
- A severe or repeated infestation can weaken a plant significantly and, on younger or already-stressed shrubs, may eventually cause death. However, established rosemary and lavender plants are resilient — even heavily defoliated specimens usually recover if the infestation is cleared and the plant is fed and watered through the recovery period.
- Are rosemary beetles harmful to people or pets?
- No. Rosemary beetles do not bite, sting, or carry disease. They pose no direct risk to humans, pets, or livestock. The main concern is purely horticultural: the damage they do to aromatic herb plants.
- What time of year are rosemary beetles most active in Greece?
- In Greece's climate, adults typically emerge and begin feeding from late summer (August-September) and remain active through mild winters. Larvae are present from autumn through to early spring. Activity slows during the hottest summer months when adults shelter in the soil. Plan your inspection routine around these peak periods.