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Best box tree moth killer UK

Updated: 22 October 2026

The best box tree moth killer UK shoppers can pick from this set depends on whether you are killing caterpillars on the leaves or watching adult moths. Seven amazon.co.uk listings were saved on 20 October 2026, with prices in pounds and no lab test. The conditional top pick for a dilutable powder is Green Guard, 50 g at £9.79, 4.0 from 185 reviews. The best value monitoring kit is the BuxTrap at £16.99, 4.2 from 146 reviews, because the powder already holds the top score. The rows sit on the [box tree moth killer comparison](/hub/pest-control/box-tree-moth-killer). Indoor moth traps were left out. A qualifying purchase can earn a commission at no extra cost to you.

The best box tree moth killer UK shoppers can pick from this set depends on whether you are killing caterpillars on the leaves or watching adult moths.

Our top picks

BuxusPro BuxTrap box tree moth trap

Best overall

BuxusPro BuxTrap box tree moth trap
8.3/10about £16.99
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Gifts by L Green Guard box treatment, 50 g

Rank 2

Gifts by L Green Guard box treatment, 50 g
8.5/10about £9.79
View offer
BuxusPro BuxBarrier spray, 500 ml

Alternative

BuxusPro BuxBarrier spray, 500 ml
5.6/10about £19.99
View offer
On this page
  1. 1.Best for large hedges
  2. 2.Best ready-to-use bottle
  3. 3.Best monitoring setup
  4. 4.When no product is a clear best

Best for large hedges

Green Guard is the powder to price first when the hedge is long enough that a ready bottle will not reach. The listing says 5 g in 2 litres treats about 30 m², the pack claims up to 300 m², and a spoon is included. At £9.79 and 4.0 from 185 reviews it is the deepest file, ahead of Habitat Harvest at £14.99 with 4.2 from 34. A saved review describes a pump sprayer on four plants, with no caterpillars seen two days later. One buyer says the dilution is not reliable. One says it did nothing. The title also says box blight treatment, and blight is not this pest. Habitat Harvest reviews cite Bacillus thuringiensis on a pack the listing calls pesticide-free. EBTS UK and BBC Gardeners' World treat effective Btk sprays as professional-only. It is the top pick only if you will read the sachet and the HSE database. Trade-offs without a winner are in the buying guide.

Best ready-to-use bottle

BuxBarrier is the only ready-to-use spray in the set: 500 ml at £19.99, 4.0 from 16 reviews. There is no 5 g measure. The listing calls it Bt-free, with a proprietary essential-oil blend, and tells you to spray affected box. Saved reviews include balls kept through a summer and a bush that looked dead and then recovered. For two or three topiary pieces, that convenience is the point. Sixteen reviews cannot support a best-spray claim. A buyer who had avoided BT products on purpose says nothing died in dry weather even when the caterpillars were sprayed directly. The listing gives no square-metre coverage. Use it when mixing is the thing you will not do, and when you have accepted that the file is split.
BuxusPro BuxTrap box tree moth trap

Testsieger

BuxusPro BuxTrap box tree moth trap
8.3/10about £16.99
View offer

Best monitoring setup

The BuxTrap is the monitoring pick: £16.99, four lures, 4.2 from 146 reviews. Hang it 1 to 1.5 m up, add about 5 cm of water with a drop of detergent, and change the lure about every six weeks. Saved reviews report a dozen moths in a few days, and more than 100 in a week after a blank start, usually where a spray was also in use. Buyers also call it flimsy and report empty weeks while moths flew. No More Mr Nice Guy at £24.98 has clearer steps, including March to October and a five-week lure change, but only 3.8 from 14 reviews. The £11.99 refill is for a trap you already own. One of 11 reviews caught a single moth while the box stayed full of caterpillars.

When no product is a clear best

There is no best product when you have not confirmed the pest. Brown streaking can be box blight, which a moth trap will not fix, and Green Guard's title mentions blight and caterpillars together. There is no best product when you need an amateur Btk spray and the societies say that route is professional. Buxus Support at £13.99 looks like the other Habitat Harvest tub, and its reviews describe a biofungicide. A 4.2 from 57 people does not correct a mismatched active. Files of 16, 14 and 11 reviews can show a direction, not a ranking against 185 or 146. If the plants are few, hand picking does not depend on a badge. If the hedge is high, or blight and caterpillars are both present, call a professional.

Common questions

Which listing is the top pick, and who should skip it?
Green Guard at £9.79, with 185 reviews and a written 5 g in 2 litres rate. Skip it if you will not check the label and the HSE database, if you need a ready bottle, or if the problem is blight. The score is not a lab kill rate. A saved review says it did nothing.
Is the BuxTrap the best killer?
It is the best monitored trap in this set, not a killer of larvae. At £16.99 with four lures and 146 reviews it is the best value badge, because the powder already took the top score. Buyers who report a saved hedge also used a spray. An empty week at the start shows up in the same file.
Why is BuxBarrier not the best spray?
It is the only ready-to-use bottle, at £19.99, and some reviews on topiary are positive. The file is 16 reviews, and one of them reports no effect when caterpillars were sprayed directly in dry weather. There is no coverage figure to set against the powders. That is too thin for a single best-spray claim.
Does a higher star rating beat a larger review count?
Not in this set. Habitat Harvest at £14.99 is 4.2 from 34 reviews. Green Guard is 4.0 from 185. The larger file shows dilution complaints and a review that says it did nothing. The refill pack is 3.9 from 11, too small to rank above either powder.
What should I buy if I only have two box balls?
Hand picking is realistic on two plants. If you want a bottle, BuxBarrier avoids mixing, and the reviews are split. A 50 g powder that claims 300 m² is a lot of product for two balls. A trap is optional monitoring, not the treatment.
Are the two Habitat Harvest powders interchangeable?
No. The £14.99 listing is the one whose reviews cite Bacillus thuringiensis, against pesticide-free marketing. Buxus Support at £13.99 cites a biofungicide, and a buyer still had caterpillars and eggs after two weeks. The same model code does not make them one product.
When is a professional the better best?
When the hedge needs a ladder, when you want an authorised Btk application, or when blight and heavy defoliation are both present. Marketplace availability is not amateur authorisation. The picks on this page are conditional shopping choices among seven listings, not a licence to spray.

Related pages

Bt versus a natural spray

Box tree moth trap and spray

Box tree moth killer

Box tree moth killer buying guide: powder or trap?

How to treat box tree caterpillar: mix, spray, check

Sources

Public UK sources used for this comparison. Shelf prices, stars and review counts are the amazon.co.uk figures captured for these seven listings on 20 October 2026. A listing is not treated as HSE authorisation.

  1. RHS box tree moth (retrieved 20 October 2026)
  2. EBTS UK box moth and caterpillar (retrieved 20 October 2026)
  3. BBC Gardeners' World box tree caterpillar (retrieved 20 October 2026)
  4. HSE garden and home pesticides (retrieved 20 October 2026)
  5. HSE pesticide product database FAQ (retrieved 20 October 2026)