Box tree moth killer buying guide

Updated: 22 October 2026

You are standing in front of a box hedge with webbing inside the leaves, and amazon.co.uk has answered box tree moth killer with powders, a ready-to-use bottle, pheromone traps and a lure refill.

You are standing in front of a box hedge with webbing inside the leaves, and amazon.co.uk has answered box tree moth killer with powders, a ready-to-use bottle, pheromone traps and a lure refill. This buying guide is the decision before the brand. It sorts the seven listings kept for this comparison, saved on 20 October 2026, into the job each one can do. The box tree moth killer comparison holds the prices and review counts. Indoor moth products were taken out, because a wardrobe trap will not touch a hedge. There was no lab test. A qualifying purchase can earn a commission at no extra cost to you.

Our top picks

Badge	Product	Treatment class	Stated rate or setup	amazon.co.uk line	Note	Price	Offer
Best overall	BuxusPro BuxTrap box tree moth trap	Funnel trap	4 lures, about 6 weeks	4.2 from 146	8.3	about £16.99	View offer
	Gifts by L Green Guard box treatment, 50 g	Dilutable powder	5 g in 2 L per 30 m²	4.0 from 185	8.5	about £9.79	View offer
Alternative	BuxusPro BuxBarrier spray, 500 ml	Ready-to-use spray	500 ml, no m² rate	4.0 from 16	5.6	about £19.99	View offer

Best overall

BuxusPro BuxTrap box tree moth trap

8.3/10about £16.99

View offer

Rank 2

Gifts by L Green Guard box treatment, 50 g

8.5/10about £9.79

View offer

Alternative

BuxusPro BuxBarrier spray, 500 ml

5.6/10about £19.99

View offer

On this page

1.Treatment classes on amazon.co.uk
2.Coverage and dilution maths
3.Authorisation and label checks
4.Who should skip traps or powders

Treatment classes on amazon.co.uk

The split is the life stage. Green caterpillars, black droppings and silk inside buxus need a spray, a hand pick, or both. Funnel traps and lure refills catch or monitor adult moths. Dilutable powders are the 50 g packs: Habitat Harvest at £14.99, Green Guard at £9.79, and Buxus Support at £13.99. The ready-to-use class is BuxBarrier, 500 ml at £19.99. The monitoring class is the BuxTrap at £16.99 with four lures, the No More Mr Nice Guy kit at £24.98 with four lures, and lure refills at £11.99 for four. Two box balls can be covered by one bottle. A driveway hedge needs a dose you can multiply. Green Guard has 4.0 from 185 reviews. The BuxTrap has 4.2 from 146. The refill pack has 3.9 from 11. A named pick is on the best box tree moth killer page.

Coverage and dilution maths

Green Guard and the £14.99 Habitat Harvest pack both say 5 g in 2 litres for about 30 m², and both claim up to 300 m² from 50 g. That claim is ten doses if you stay at 5 g. A 10 m run of hedge at 1.5 m high is about 15 m² of face, and dense box has an inside as well, so one dose can cover less length than the packet sounds. Buxus Support prints the same 5 g line, but buyer notes describe a biofungicide, so do not borrow its coverage as if it were the same spray. BuxBarrier has no square-metre rate. No More Mr Nice Guy states one trap per 0.5 acres, a field density, not a patio pot. A saved Green Guard review says the dilution was unreliable and a stronger mix would not stay affordable. That is a cost warning, not a reason to invent a rate.

Testsieger

BuxusPro BuxTrap box tree moth trap

8.3/10about £16.99

View offer

Authorisation and label checks

BBC Gardeners' World and EBTS UK say the Btk products which actually kill these caterpillars are not licensed for amateur use in the UK and are treated as professional products. The Health and Safety Executive expects a pesticide to be authorised for the situation you spray. None of the seven listings has been matched here to an HSE record, so a star rating is not permission. Habitat Harvest's £14.99 powder is marketed as pesticide-free, while UK reviews say the pack names Bacillus thuringiensis. Check the sachet, then the product name on the HSE database, before you mix. BuxBarrier is sold as Bt-free, and the label still comes first. Buxus Support reviews point at a biofungicide. If the only product that would work is a professional Btk spray, that is a contractor conversation.

Who should skip traps or powders

Skip a trap if the leaves are already webbed. The BuxTrap and the No More Mr Nice Guy kit catch adults. Buyers who kept a hedge describe a spray used as well. Skip the £11.99 refills if you have no trap body. Skip Buxus Support if you wanted the other Habitat Harvest powder. The model line BG-CAT50 appears on both and does not make the actives the same. Skip a 50 g powder if you will not measure 5 g, or if the plants are two balls you can pick over in an evening. Gardeners' World still treats hand removal as a real option on a small number of plants. Skip BuxBarrier if you need a written coverage figure before you spend £19.99. One saved review reports no kill after a direct spray. Call someone in when the hedge needs a ladder you do not trust, or when blight and caterpillars are both present.

Common questions

Will a trap alone stop caterpillars eating the hedge?

No. The BuxusPro trap at £16.99 and the No More Mr Nice Guy kit at £24.98 catch adult moths. Caterpillars inside webbing are not in the bucket. Use a foliar product or hand picking for the larvae, after you have checked the label.

How do I mix the 50 g powders in this comparison?

Green Guard and the £14.99 Habitat Harvest listing both say 5 g in 2 litres for about 30 m², with a spoon in the pack. Buxus Support prints a similar line, but reviews describe a biofungicide. The label in the parcel overrides the listing if they differ.

Is Bacillus thuringiensis legal for me to spray in the UK?

EBTS UK and BBC Gardeners' World describe effective Btk caterpillar products as professional-only. The HSE database is the check for a named product and the plants it may be used on. Reviews on the £14.99 powder cite Bacillus thuringiensis on a pack the listing calls pesticide-free. This page cannot clear that product for your garden.

What is the difference between the two Habitat Harvest powders?

The £14.99 pack is the one whose reviews cite Bacillus thuringiensis. The £13.99 Buxus Support pack cites a biofungicide. Both are 50 g, both say 5 g in 2 litres, and both carry the model line BG-CAT50. They are not substitutes.

How often do I change pheromone lures?

The BuxTrap listing says about every six weeks, and also 4 to 6 weeks per lure. The refill listing says up to eight weeks. No More Mr Nice Guy says every five weeks. Use the interval on the lure you bought.

Can I use a pantry moth trap on box?

No. Pantry and clothes moth lures are for indoor species. They were removed from this comparison for that reason. A box tree moth lure is a different pheromone, and even the correct lure only monitors adults. If the parcel is aimed at a kitchen cupboard, it does not belong on the hedge.

Should I hand pick instead of spraying?

On a few topiary pieces, yes. Gardeners' World treats hand removal as a real option when you can reach the webbing. It does not scale to a long hedge, and it does not replace a blight check if the stems are blackening. If you spray, the class and the authorisation still come before the brand.

Bt versus a natural spray

How to treat box tree caterpillar