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Box Tree Caterpillar Nematodes

(2 customer reviews)


Quantity Price
1 £17.99
2+ £15.99

To control Box Tree Caterpillar spray with Nemasys Fruit and Vegetable Protection NematodesTo protect your box plants / trees from Box Tree Caterpillars, spray with Nemasys® 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. Nemasys® F&V TRIPLE Pack – 3 Packs sent together for controlling caterpillars. Nemasys® 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. Pre-order for delivery in the spring by selecting a future date below.

N.B. Need a Sprayer? Add one to your basket and save £3.50 off a Solo Sprayer or save £3.99 off a Rechargeable 5 Litre Sprayer when bought with your nematodes (savings applied at the checkout).

Special Offer

Select a future w/c dispatch date or leave today’s date for dispatch ASAP * 

Full Description

Nemasys® F&V  This unique mix of different nematodes will protect your fruit and vegetables from the main insect pests including carrot root fly, cabbage root flycutwormsonion flysciarid flycaterpillarsgooseberry sawflythrips, and codling mothNemasys® F&V is safe to use on food crops, is suitable for use on organic crops and it will not harm pets, children, wildlife or bees. Apply Nemasys® F&V to the soil with a watering can / hose end feeder to control soil based insect pests (soil temp of 12c required) OR apply with a sprayer to control caterpillars and thrip and continue to apply while the pests are active. Nemasys® F&V is supplied as a powder, which is mixed with water and each pack will treat up to 60sqm/70sq yds (to treat a smaller area just make the solution stronger as it is impossible to overdose).

  • To control soil based pests – Apply Nemasys® Fruit and Vegetable Protection at 2 weekly intervals throughout the growing season.Order Nemasys® F&V individually or we recommend the twin pack (2 packs per delivery), giving 4 weeks control (use one and pop the other one in the fridge to use 2 weeks later) and save money too.
  • Control caterpillars (including Box Tree Caterpillars)/ sawfly / codling moth – Apply Nemasys® F&V 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 in a triple pack (3 packs per delivery – apply 3 times at 7 day intervals).

Nemasys® F&V SINGLE Pack (2 weeks control) treats 60 sqm
Nemasys® F&V TWIN Pack – 2 Packs sent together (giving 4 weeks control – use one at a time at 2 week intervals) each pack treats 60 sqm SAVING £2.00
Nemasys® F&V TRIPLE Pack – 3 Packs sent together for controlling caterpillars, sawfly and codling moth (apply 3 times at 7 day intervals) each pack treats 60 sqm

How is it sent? – Nemasys® Fruit and Vegetable Protection is 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. N.B. Large orders i.e. 5 or more large packs will not fit through the letterbox, so someone will need to be in to receive it.

How to apply? – Apply Nemasys® Fruit and Vegetable Protection 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 Nemasys® F&V 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 Nemasys® F&V 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 Nemasys® F&V 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 Nemasys® F&V 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 Nemasys® F&V 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 Nemasys® F&V 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 Nemasys® F&V 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 Nemasys® F&V 3 times as a drench AND to the foliage at 2 week intervals throughout the growing season.

N.B. Nemasys F&V needs 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.

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