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Box Tree Caterpillar Nematodes

(13 customer reviews)


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1 £19.99
2+ £18.99

To control Box Tree Caterpillar spray with Fruit and Vegetable Protection NematodesTo protect your box plants / trees from Box Tree Caterpillars, spray with Fruit and Vegetable Protection Nematodes when the caterpillars are spotted and the DAYTIME temp is 12c. We supply 3 packs, which are applied 3 times at 7 day intervals. Nemasys® F&V works at temperatures above 12°C/40°F, so apply during the growing season i.e. between March and October. F&V TRIPLE Pack – 3 Packs sent together for controlling caterpillars. F&V is a living, perishable product (it will keep for 2 weeks in the fridge), so order when you are ready to apply and the caterpillars are present. Each pack treats 60 sqm. N.B. F&V works at temperatures above 12°C/40°F and is a perishable product (it will keep for 2 weeks in the fridge), so order when you are ready to apply or pre-order by inserting a date below. 

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Full Description

Use this unique mix of different nematodes will control box moth caterpillar on your box plants PLUS us it on fruit and vegetables to control the main insect pests including carrot root fly, cabbage root flycutwormsonion flysciarid flycaterpillarsgooseberry sawflythrips, and codling moth. Box Tree Nematodes are safe to use on food crops, is suitable for use on organic crops and it will not harm pets, children, wildlife or bees. Box Tree Nematodes needs a minimum temp of 12°c and is a perishable product, so order when you are ready to apply – normally between March and October. Supplied in sachets as a powder, which is mixed with water and applied with a sprayer treating up to 60sqm– to treat a smaller area just make the solution stronger as it is impossible to overdose.

Control Box Tree Caterpillars – Apply the Box Tree Nematodes 3 times at 7 day intervals when the the caterpillars are 1st spotted and re-apply as necessary to keep caterpillars at bay. We supply 3 packs of Fruit and Veg Nematodes (3 sachets per delivery – apply 3 times at 7 day intervals).

Box Tree Nematodes TRIPLE Pack – 3 Sachets sent together for controlling caterpillars (apply 3 times at 7 day intervals) each pack treats 60 sqm

How is it sent? – Box Tree Nematodes are a perishable, living product, so it is sent out fresh by Royal Mail 1st class post. Being a perishable, living product, it must be used before the expiry date (which is marked on the inside of the pack and will be at least 2 weeks) and it must be stored in the fridge until it is needed. Once opened, the contents do not keep, so it must be used in one day – do NOT store the made up solution or powder. 1 or 2 packs will go through your letterbox and should be popped in the fridge as soon as possible – they are fine on the doormat while you are at work.

How to apply? – Apply Box Tree Nematodes to the soil with a watering can or hose end feeder to control soil based insect pests OR apply with a sprayer to controlling caterpillars and thrip.




Box Tree Caterpillars These caterpillars feeds on box plants causing severe defoliation and produce large amounts of webbing. As the caterpillars feed, areas of dieback may appear, which will be especially apparent on trimmed plants. Box Tree Caterpillars are greenish-yellow with black heads and once fully grown the caterpillars reach up to 4cm in length and will have a thick black and thin white stripes along its body. In the spring, the moths appear and there can be up to 3 generations of caterpillars a year. Box Tree Caterpillars over-winter as caterpillars rather than as moths, so it is essential to kill as many of the caterpillars as possible before the temperatures drop in the autumn. The caterpillars over-winter, hidden between leaves that have been spun together with silk and will then emerge next spring as moths to reproduce and produce the next generation of caterpillars. To make sure your box plants / trees are free from Box Tree Caterpillars before the winter, spray with Nemasys® Fruit and Vegetable Protection BEFORE temperatures drop.

Apply 3 times as soon as the caterpillars are first seen (normally May). Repeat 3 times at 7 day intervals. Re-apply as needed to keep the box plants free of caterpillars.

Carrot Root Fly

A widespread pest of carrots, parsnips, celery, celeriac & parsley causing tunnels in the roots. Carrot Root Fly can be a particularly problem in old established gardens where the pest builds up each year. It lays eggs in the soil adjacent to the plant, the eggs hatch out and the 9mm yellow/white maggots burrow into the roots. The maggots stay in the ground over winter, pupate and the life cycle starts again in the spring. Two further generations can appear during the year.

Apply as a drench after sowing and repeat fortnightly throughout the growing season.

Cabbage Root Fly A pest of all brassicas (cabbages, cauliflowers, etc) and root vegetables (turnip, swede and radishes). The fly lays eggs in the soil near the plants and when the eggs hatch the maggots feed on the plant roots. Older plants may survive an attack, but grow slowly and wilt on sunny days. Cabbages often fail to heart and cauliflowers form a tiny heads. Brassicas are particularly vulnerable as seedlings, as they can be be killed by the maggots. The maggots eat the fine roots and just leave a rotting stump, or when roots are swollen as in radish, swede and turnip, they will bore into the roots leaving an inedible mess.

Apply as a drench after sowing and repeat fortnightly throughout the growing season.

Onion Fly Attacks onions, leeks, shallots and garlic. The eggs of the onion fly are white and are laid near the base of the plant or in the leaves. In early summer the eggs hatch and the maggots attack the roots causing them collapse and die. In late summer a second generation feed on the swelling onion bulbs causing them to rot. The severity of attacks varies from year to year but, in a bad year, it is almost impossible to grow these crops.

Apply as a drench after sowing and repeat fortnightly throughout the growing season.

General Caterpillars Occur from spring to early autumn. Caterpillars can decimate a vegetable plot, especially brassicas PLUS they love ornamentals such as roses. The caterpillars feed on the outer leaves leaving holes and can completely strip leaves.

Apply 3 times as soon as the caterpillars are first seen (May – September) applying to all leaf surfaces. Repeat 3 times at 7 day intervals.

Gooseberry Sawfly This pest attacks gooseberries and red and white currants and can strip them of all leaves. Gooseberry Sawfly Caterpillars are up to 20mm long, pale green with two of the species being heavily marked with black spots. Damage starts mid to late spring, but there can be several generations in a season. Apply as soon as the caterpillars are first seen applying to all leaf surfaces, making sure the spray comes into contact with the caterpillars.

Apply 3 times as soon as the caterpillars are first seen (normally May) applying to all leaf surfaces. Repeat 3 times at 7 day intervals.

Cutworms Cutworms are soil-dwelling caterpillars of several species of moth. The can be up to 40mm long and are creamy-brown, greenish-brown or greyish-white in colour. They emerge in June / July and feed on vegetables, fruit and ornamental plants. A second generation then hatches out in August/September causing even more damage. Cutworms cause damage by chewing the base of stems, roots, leaves and tubers. Roots may be severed just below the soil or the outer bark is eaten away leaving the plant to wilt and die. They may attack root vegetables such as potatoes and carrots leaving cavities in them.

Apply as a drench after sowing and repeat fortnightly throughout the growing season.

Thrips Thrip attacks plants including African violet and chrysanthemum – damaging growing points and causing mottling, distortion and blistering of leaves. On cucumbers fruit is small and twisted.

Apply 3 times as a drench AND to the foliage at 2 week intervals throughout the growing season.

N.B. Box Tree Nematodes need a temperature of 12°C/40°F and is a perishable product (it will keep for approx 2 weeks in the fridge)so please order when you are ready to apply. As the biggest supplier of nematodes in the UK and because we have fresh deliveries of nematodes each week, you are guaranteed the freshest stock with the longest expiry date available. In the season our nematodes are dispatched DAILY by 1st class post.


  1. Mrs JM Hill (verified owner)

    I have used this company a lot. Regular nematodes, camera bird box, squirrel repellent and so on. Always reliable and prompt.

  2. Martin (verified owner)

    We live in Cheltenham, we dealt with the moths by manual removal and then with nematodes, it seems to have been effective.

  3. Jacqueline van Bommel

    After 1 large box got defoliated I bought this as a last ditch attempt to save my 4 remaining really large box shapes I have nurtured since 1998 that were also showing signs. I sprayed as instructed, picked off caterpillars as I saw them for about 10 days and put up the lure. 3 of the lesser infected look like their old selves 6 weeks later. I pruned the 3ft globe that was really badly infected back hard to get to all the webs and caterpillar’s and it now has lots of tiny green leaves. No caterpillars to be seen and 5 moths in the trap. A great result and the price of the treatment is less than replacing 1 of these large box shapes.

  4. Jon (verified owner)

    Excellent! After three weeks new green leaves are sprouting on our previously almost naked box hedge!

  5. W S Farrow (verified owner)

    Excellent service. I bought nematodes for Box Moth and, touch (box) wood, they appear to have worked – hedging is growing back. Well worth a try if you have these beastie caterpillars!

  6. Susanne Jones (verified owner)

    Hopeful signs of green leaves returning to my treasured hedge. Thank you.

  7. Dr Gwynneth (verified owner)

    My miniature box trees were in danger of being totally devastated by box tree caterpillars this year I was in despair until I found these nematodes on the Green Gardener website. I have diligently applied these as advised throughout this summer and they have saved my treasured plants. Although there has been some devastation of foliage prior to the treatment there has been no further damage inflicted since I started with this product. I also have used the foliage feed from Green Gardener and my plants are now showing new growth and beginning to return to their previous beauty. I have just treated all to a final session of nematodes ain view of the recent mild weather.

  8. Matthew Verrall (verified owner)

    Always found to be very helpful and what I have purchased has always worked.

  9. Robin Dixon (verified owner)

    I bought nematodes to hopefully take care of our significant box caterpillar issue. Ordering was easy, delivery quick. We are two out of three applications in and there is definitely progress. If the problem is fully resolved after the third spray, I shall upgrade this review to 5 stars!

  10. Angela Morgan (verified owner)

    Great delivery. nematodes working and we have new growth so relieved though hedge was done for!

  11. Karen Hurley (verified owner)

    The delivery service and packaging were good. The advice provided regarding the use of the product was detailed and clear. The product appears to have been effective,- fingers crossed!

  12. Mrs Roche (verified owner)

    12 days after ordering from an alternative supplier, the nematodes still not arrived, & caterpillars destroying my boxbush. Ordered from Green Gardener & rec’d within 24 hrs, brilliant service, thank you!

  13. Matthew Verrall (verified owner)

    Good products that work 💯%

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