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Slug Killer Nematodes - Phasmarhabditis sp.


*Any outstanding orders will be despatched on July 1st upon receipt of fresh stock*

What Damage Can Slugs Cause?

Slugs can be a highly damaging pest and are particularly fond of succulent seedlings, which if left unprotected, can be completely destroyed in a single night. 

As well as attacking the leafy parts of plants, Slugs will also feast on fruit and vegetable crop. They will chew holes in ripening Strawberries and Tomatoes, and also eat Potatoes, which are of course grown underground, so you may be unaware that such crop is even being attacked.

Identifying Slug Activity

If your seeds do not appear to have germinated, it is possible that Slugs have devoured the emerging seedlings underground. Other indices of recent activity may be made apparent by slime trails, or irregular holes with smooth edges found on leaves.

What Are Slug Killer Nematodes & How Can They Help?

Dragonfli Slug Killer Nematodes are a biological molluscicide containing invective juveniles of Phasmarhabditis sp.. The Phasmarhabditis sp. are minute worm-like nematodes that are approximately 0.3 - 0.5mm long and transparent in appearance. They occur naturally in soils in areas prone with molluscs and are very active when observed under microscope. 

The nematodes, when applied, will enter the slugs via a natural opening, like the mouth, and feed on the contents of the slug. A natural bacterium is produced by the nematodes inside the slug, which kills it. Infected slugs will be completely broken down by the nematodes. The nematodes also reproduce inside the larvae, releasing more nematodes into the surrounding area. 

When Should I Apply The Nematodes?

Slug Killer Nematodes should be applied as soon as Slugs have been identified in the soil. The best application times are from Spring to Autumn

How Many Nematodes Do I Need?

We sell Slug Killer Nematode packs to treat areas of either 30-40m2 70m2, 90m2or 100m2.

Each application of nematodes will provide at least six weeks control of slugs.

What Conditions Do The Nematodes Require?

Choose a humid or wet day to apply your Slug Killer Nematodes. Nematodes are UV-sensitive and will not survive long when exposed to bright, sunny conditions. Apply the nematodes early in the morning or early in the evening in order to utilise the optimum humidity levels. Avoid application in frosty conditions.

Soil temperatures should be above 5℃ for the nematodes to be active, if applying in the spring.

How Do I Apply The Nematodes?

Application Instructions For The 30-40m2 Pack

1. Cut open the sachet with scissors and mix the contents into 1 Litre of lukewarm water.

2. Stir the solution until all carrier contents are dissolved. Now you have your nematode concentrate.

3. Take 333ml of concentrate and pour into a watering can. Top up with water until you reach 10 Litres.

4. 1 Litre of nematode concentrate provides enough solution to make up to 3 watering cans of 10 litres.

5. Pour and apply the Slug Killer Nematode solution over the soil / compost area you wish to treat.

One watering can of 10 Litres should treat an area of up to10m2Slug Killer Nematodes can also be applied with our Nema Super Sprayer.

Application Instructions For The 70m2 & 90mPacks

Apply each of your sachets following the above application instructions.

Can I Store Slug Killer Nematodes?

Slug nematodes have a short shelf life compared to other species, apply as soon as possible after receipt.

Slug Killer Nematodes are harmless to humans, pets and wildlife, and safe to apply to edible plants

General Tips

1. Do you only have a few plants or a few m2 garden to treat?

Then add the Slug Killer Nematodes to the amount of water that you normally give to the plants.

2. Want to use a nematode garden sprayer? 

Set the sprayer on mist mode and use a nozzle with holes at least 0.5 mm in size. Make sure the pressure does not exceed 5 bar


Phasmarhabditis sp. is a 100% natural and organic product. The product is registered and can be safely used in the UK. Phasma is not harmful to humans, pets, plants, earthworms, bees or birds.

Establish Complete Control Over Slugs & Snails By Also Using Our Ferrimax Organic Slug Pellets

Ferrimax Organic Slug Killer is a certified, environmentally friendly pellet for killing Slugs and Snails. The natural active ingredient, ferric phosphate, is harmless to wildlife, humans and the environment. Once the Slugs and Snails feed on the Ferrimax pellets, they crawl away to die.

    Customer Reviews

    Based on 2 reviews
    Elaine Halls
    Works well

    Works well at reducing the slug load and gives young plants a window of opportunity to grow....unless you also have mice!