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Slug pellets vs nematodes: which one fits the bed

Updated: 23 October 2026

You have already tried eggshells or a copper ring, and the search offers both a tub of pellets and a packet you water in. They are not substitutes, and the gap is widest when the pest is snails. This page says when ferric phosphate pellets fit and when nematodes fit. Prices stay on our [slug pellets comparison](/hub/pest-control/slug-pellets). The poison line is on [slug pellets, pets and wildlife](/hub/pest-control/slug-pellets/sub/slug-pellets-pets-and-wildlife). No nematode pack was included here, so this page does not invent a price for Nemaslug. If you buy through our links, we may earn a commission at no extra cost to you.

You have already tried eggshells or a copper ring, and the search offers both a tub of pellets and a packet you water in. They are not substitutes, and the gap is widest when the pest is snails.

Our top picks

Provanto Provanto Slug & Snail Killer Max 800 g

Best overall

Provanto Provanto Slug & Snail Killer Max 800 g
8.8/10about £7.32
View offer
Neudorff Neudorff Sluggo Slug & Snail Killer 800 g

Alternative

Neudorff Neudorff Sluggo Slug & Snail Killer 800 g
8.6/10about £7.99
View offer
Pestshield Pestshield 4 × Slug & Snail Killer 300 g

Best value

Pestshield Pestshield 4 × Slug & Snail Killer 300 g
8.6/10about £10.93
View offer
On this page
  1. 1.Two different tools
  2. 2.When pellets are the one that fits
  3. 3.When nematodes are the one that fits
  4. 4.What is neither

Two different tools

A slug pellet here is ferric phosphate bait. You scatter it on moist bare soil. Slugs and snails eat it, stop feeding, and usually die out of sight. It is a pesticide. The label rate binds you. The RHS advises against pellets, including organic ones, because of wildlife. Which? has reported that ferric phosphate worked in its tests, and it has named Growing Success in that account. A nematode product is a living parasite, Phasmarhabditis hermaphrodita, which you water into the soil. AHDB's commercial guidance says the nematode enters the slug, feeding stops soon, and death takes about 7 to 21 days. It works best on the grey field slug. The soil has to stay moist. The RHS gives a soil-temperature window of about 5°C to 20°C. Which? says apply through a coarse rose when the soil is above 5°C. A fine rose blocks the nematodes. If you need something that also hits snails this week, the drench is the wrong animal.

When pellets are the one that fits

Choose pellets when the damage is snails as well as slugs, and you accept a pesticide at the label rate. Nematodes are unlikely to affect snails. Pellets also fit when the soil is still below 5°C, if your packet allows a bait and the soil is moist enough for slugs to be moving. You do need the gram rate on that tub. Sluggo's listing says 5 g per square metre. Ultra+'s manufacturer page says 2.5 g. Those are not interchangeable. The steps are on how to use slug pellets. Birds take pellets, and a dog that eats a spill needs Animal PoisonLine. If the damage is underground and you are already inside the nematode season, surface bait is missing the pest.
Provanto Provanto Slug & Snail Killer Max 800 g

Testsieger

Provanto Provanto Slug & Snail Killer Max 800 g
8.8/10about £7.32
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When nematodes are the one that fits

Choose nematodes when the pest is slugs, the soil is moist, and the temperature sits from about 5°C to about 20°C. Water them on with a coarse rose, in dull weather, and keep the soil damp afterwards. AHDB's 7 to 21 days is the death window in that guidance, and about six weeks is the persistence figure when conditions stay wet. A patio pot that dries out will not hold that six weeks. One April drench is not a year of control. Larger slugs are a weaker target than small grey field slugs. Snails are the skip. Check the live pack for the area it treats, the use-by date and the storage temperature. You can use both only as separate jobs. Do not mix the nematode pack into a tub of pellets.

What is neither

Wool pellets, seaweed, eggshells, bark, grit and copper tape are barriers. The RHS trial on lettuces found no protection difference between eggshells, bark, copper tape, grit and wool pellets. That result is a reason not to treat those barriers as a proved substitute. The FERRIS listings say the pellets are ferric phosphate and infused with nematodes. A nematode is watered in, alive, inside a temperature window. It is not a dry pellet at 5 g per square metre. Paying about £11.99 or £18.99 for FERRIS does not buy that biological control. For a normal UK bed: pellets when you need a surface bait for slugs and snails and you will follow the label. Nematodes when the soil is moist and warm enough and the pest is slugs.

Common questions

Do nematodes replace pellets?
Only for slugs in moist soil inside the temperature window. They do not replace a surface bait for snails, and they do not work as a dry scatter. The RHS prefers you avoid pellets. Which? still found ferric phosphate effective. The replacement is conditional.
Will nematodes kill snails?
Do not count on it. The RHS says they are unlikely to affect snails, and Which? reports that Nemaslug worked on slugs in the ground and not on snails. If snails are the animal on the hostas, a drench is the wrong tool even when the soil is a wet 15°C.
What soil temperature do they need?
About 5°C or warmer, up to about 20°C on the RHS window. Which? says early spring to late autumn, soil above 5°C, applied with a coarse rose. On frozen ground, wait or use a different method.
How soon does feeding stop?
AHDB says feeding stops soon after the nematode enters the slug, with death in about 7 to 21 days, and about six weeks of effect in ideal wet conditions. That is guidance for the grey field slug, not a promise that a dry pot will be clean in a week. Keep the soil moist and judge the leaves.
Can you use both?
Yes, as separate treatments. Pellets stay a surface bait at the label rate. Nematodes are watered into moist soil in their season. Do not combine them in one container, and do not use a FERRIS tub as if it were already both.
Is the FERRIS tub a nematode product?
No. The bullets on B09XJL6JTC and the two-pack claim a nematode infusion on a ferric phosphate pellet. Nothing in the file shows a watered-in pack. Treat it as bait with a conflicting sentence, or do not buy it for the nematode.

Related pages

Ferric phosphate slug pellets

Slug pellets

Best slug pellets UK: one tub and who should skip it

How to use slug pellets: rate, rain and a thin scatter

Are slug pellets safe for dogs, children and hedgehogs?

Sources

Public UK sources used for the ban, the label duty, wildlife and manufacturer rates. Shelf prices, stars and review counts are the amazon.co.uk figures captured for these nine listings. Last checked 21 October 2026.

  1. GOV.UK metaldehyde ban (retrieved 21 October 2026)
  2. Defra media blog on the metaldehyde ban (retrieved 21 October 2026)
  3. HSE garden pesticides (retrieved 21 October 2026)
  4. RHS slugs and snails (retrieved 21 October 2026)
  5. Which? how to get rid of slugs and snails (retrieved 21 October 2026)
  6. Neudorff Sluggo (retrieved 21 October 2026)
  7. VPIS slug and snail control (retrieved 21 October 2026)
  8. Westland Growing Success slug killer (retrieved 21 October 2026)