Slug and Snail Management: The Final Information

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The sight of verdant younger shoots pushing via warming spring soil lifts the guts of each gardener. After weeks of anticipation the backyard is lastly transferring. We rush to the greenhouse and begin frantically sowing, gleefully admiring trays brimming with new seedlings. Hoes and rakes are joyfully unleashed from darkish sheds, the soil is tilled, seeds are scattered. At the top of the day, as daylight rakes throughout our drained however glad brows, visions of good lettuces, juicy peas and drifts of flowering annuals dance earlier than our eyes. Spring – the season of optimism! 

But behind that optimism is a hidden nervousness. There is one thing nasty lurking below the leaf litter in the back of your thoughts. And instantly, in a single damp night time, swathes of harmless child seedlings are ruthlessly massacred, keen buds nipped off of their prime, valuable younger shoots ripped to shreds. Yes! Those monstrous molluscs have returned: Slugs and snails.

Spring into motion towards slugs and snails

Tray of tomato seedlings

These seedlings are tender and leggy and supply glorious fodder for slugs and snails
Image: Canva

As temperatures rise, slugs and snails emerge from hibernation the place the power to super-cool their our bodies has protected them from freezing. Meanwhile, generations of eggs laid within the autumn are busy hatching all through April and May. All of those animals emerge with raging appetites, and because the spring backyard serves up a banquet of soppy and succulent meals who can blame them for gorging on the feast?

From 1 April 2022 it’s now unlawful to promote and use metaldehyde slug pellets. So, whether or not you prefer it or not, this specific weapon can now not be a part of your armoury towards the gardener’s primary enemy. British gardeners have been utilizing some 650 billion slug pellets per yr – and there’s no doubt about it – they labored. Sadly, they labored reasonably too effectively. Only a small quantity of metaldehyde is required to poison or kill non-target animals and because the pellets included a bait, each animal which occupies your backyard – birds, frogs, toads, newts, hedgehogs, sluggish worms, mice, even your pets – was in danger.

The excellent news is that there are lots of different and protected slug and snail deterrents. But which truly work? Being ready upfront of the enemy is essential – so let’s look at the choices each foolish and wise – and while we’re at it, take a more in-depth take a look at these much-maligned molluscs, delving into darkish, damp corners to uncover a few of their slimy secrets and techniques.

 

Hand at hand fight

close up of booted foot about to squash a large orange slug

Some gardeners are extra ruthless than others!
Image: Shutterstock

Post-war gardeners had been manufactured from stern stuff. My mum would pluck a slug from the bottom, confront it eyeball to eyestalk after which abruptly slice it in two together with her secateurs. I don’t depend myself as a squeamish gardener, however it is a bit an excessive amount of for my abdomen. Neither am I that keen on her different technique: the nightly ritual of slug-stalking with a salt cellar which the next morning would go away hazardous swimming pools of slug-gloop alongside the trail awaiting my younger unshod toes.

I’m nevertheless keen on the satisfying scrunch of crushing snails beneath my boot. But I confess to being a cowardly killer, as I favor to not look too carefully at my victims as they flinch below my boot. As effectively as their eyes, snails have gentle sensing cells dispersed throughout their outer pores and skin which allows them to shortly react to the hovering shadow of a murderous hand or boot. Other urged molluscan homicide strategies embrace accumulating all of them in a bucket. Exactly what you do along with your bucket of slugs and snails afterwards I have no idea or care to ponder.

Close up of slug with clutch of translucent eggs

Slugs lay as much as 200 eggs per sq. metre
Image: Shutterstock

Are these strategies efficient? Well, they actually fulfill the gardener’s thirst for revenge. But do they make any vital dent within the inhabitants of molluscs that are busy consuming your backyard? The downside is, though you could not discover these molluscs enticing, they discover one another positively irresistible. Both slugs and snails are hermaphrodite, which is a definite benefit for such sluggish animals which may in any other case have issue bumping into the ‘right’ associate; and each get pleasure from very elaborate courtship rituals which may go on for hours. In truth, gastropods have voracious appetites for love in addition to meals and may boast of very adventurous intercourse lives, so adventurous that the subsequent time I look a snail within the eye each of us may blush. All this romance implies that the typical backyard has 20,000 slugs and lay as many as 200 eggs per cubic metre. So I’m afraid you’ll have received the battle, however the slugs have undoubtedly received the struggle.

Create a slug zone

Close up of gloved hand holding a slug and in the background a bucket of slugs surrounded by tomato plants

Slugging it out with a bucket load of slugs is just not for the faint hearted
Image: Shutterstock

One suggestion I’ve come throughout on the web is to ‘deliberately attract slugs’ to an space of your backyard away out of your goal crops after which to exit and acquire them at night time. Gardeners World suggests “using something they’re attracted to – old veg leaves, dried cat food, bread rolls, oats or bran”. To me, this seems like an excellent method of attracting rats in addition to molluscs and provided that rats have a substantial velocity benefit, I believe that each slugs, snails and the gardener are more likely to find yourself disillusioned by the outcomes.

It additionally raises the identical tough downside encountered above –  what do you do along with your bucketful of slugs and snails? One conventional answer has been to lob them over the neighbour’s fence. If you might be having a boundary dispute along with your neighbour this can in all probability give appreciable satisfaction, till that’s, these crafty slugs and snails discover their method dwelling. Unfortunately, scientists have found that snails are outfitted with a homing intuition. This means they must be hurled at the least 20 metres away to make sure they received’t discover their method again – a feat which might require the arms of an Olympic shot putter.

I’m left with a sinking feeling that this undertaking is doomed to backfire – the neighbour is having fun with a backyard freed of slugs, snails and rats while I’m saddled with a bucketful of slimy slugs and snails and a chilly stroll within the night time to eliminate them.

Eggshells, sawdust, espresso grounds, wooden ash, human hair, grit, etcetera, etcetera

Close up of person holding trowel and scattering wood ash between rows of lettuce

Disappointingly, pure home-made limitations similar to wooden ash are lower than ineffective on slugs and snails
Image: Shutterstock

Sorry, however all of those strategies are completely ineffective. This is as a result of slugs and snails are outfitted with a brilliant energy: slime! Acting as each an adhesive and a lubricant, this slime has miraculous elastic properties and the power to alter its consistency when stress is utilized. Get slug slime in your pores and skin and you will see it a satan to scrub off, resulting from its supreme stickiness and spectacular capability to carry water. Scientists have even taken inspiration from slug slime to develop medical glues which can bond moist tissues and stem bleeding. Even hedgehogs discover slug slime troublesome to take care of. This video reveals a hedgehog de-sliming its slug meal by rolling it on the bottom!

 

Dr Hodgson of Exeter University has found that snails use as much as 30 % of their vitality in slime manufacturing and studies that ‘snails move in convoys, piggy-backing on the slime of other snails to conserve energy’. Slime not solely assists motion however can also be designed to forestall damage when molluscs transfer over tough surfaces. Their elegant slime implies that slugs and snails can fortunately glide throughout razor blades and they are going to be laughing off your puny human efforts to discourage them with mere eggshells.

 

Close up of grey slugs making slime trails across a piece of wood

Slime is a brilliant energy! But wool pellets are an efficient weapon
Image: Shutterstock

Put apart your eggshells and occasional grounds and take a look at wool pellets as an alternative. If you discover wool jumpers itchy, then so do slugs! Wool fibres are extremely hygroscopic, that means they soak up moisture. This, plus pure sands and grits within the wool and salts from sweaty sheep, sucks up slime and causes irritation to the slugs so that they crawl off searching for simpler meals.

After inserting them across the base of the plant the pellets are totally watered. This causes them swell and bind collectively forming a dense matt which isn’t disturbed by wind or rain. Although wool pellets are fairly expensive the mat will final for as much as 12 months and has the bonus of appearing as a mulch which can supress weeds and retain moisture, breaking down naturally within the soil to slowly launch vitamins.

I planted out plenty of sunflower seedlings final yr and bored with watching each being felled by marauding molluscs I attempted wool pellets. I’m happy to report that they had been a convincing success. They must be piled up in a large, thick barrier ( at the least 4inches (10cm) extensive and some inches deep) so are good for shielding particular person specimens similar to hostas, delphiniums, candy peas and lupins however not so helpful for lengthy rows of seedlings.

Bottle of Grazers concentrate and a bottle of Grazers ready to use spray

Grazers is offered as a focus or a ready-to-use spray
Image: Thompson & Morgan

Grazers supply a variety of natural pest-deterrents in a liquid kind that are primarily based on calcium, with totally different formulations tailor-made to totally different pests. I’ve actually had success utilizing Grazers to discourage rabbits and pigeons, so their slug and snail method appears to be like a promising guess. What I’ve discovered is that for Grazers to achieve success you might want to apply it totally and repeat spray at intervals. How usually you might want to re-apply will largely depend upon rainfall, time of yr and development charges so it varies from a number of days to some weeks. Fast rising younger crops with tender tissues that are topic to heavy spring rains will want extra frequent functions. If you might be solely treating one or two crops then a handheld sprayer is ok however eager gardeners can be effectively to put money into a pressure sprayer for this activity. This lets you make up a tank of combine after which seize it and speedily spray your susceptible crops every time required.

The calcium contained in Grazers is absorbed via plant leaves and stems into plant cells. It doesn’t kill slugs and snails however makes plant tissues distasteful so they’ll search different meals sources. It takes a short while for the calcium to be absorbed and moved via the plant, so if you’re transplanting susceptible younger crops from the greenhouse to their outside positions, it’s a good suggestion to deal with them with Grazers for a couple of days previous to doing so. Price smart, Grazers is a comparatively financial choice, but it surely clearly requires extra labour than placing down wool pellets. However, it’s higher suited to giant areas of crops or ornamentals.

Gastropod grazing habits

Not for nothing are slugs and snails referred to as ‘gastropods’ –  actually an ‘eating foot’. These animals have developed into extremely environment friendly munching machines and they aren’t simply postpone their meals. Grazers is the one business product which makes plant tissues distasteful to them. Both slugs and snails are outfitted with a ribbon-like tongue referred to as a radula which is roofed in 1000’s of tiny tooth, neatly organized in rows. In truth, the backyard snail has about 14,000 tooth! By grinding the radula towards its sexy jaw, the slug or snail rasps at its meals. This causes the ragged abrasion of plant surfaces which is attribute of slug and snail injury. It additionally allows them to grind their method via harder meals like your potato tubers. They could lose a couple of tooth within the course of, however new ones shortly regrow of their place. Once previous the mouth meals enters a holding bay or ‘crop’ so slugs and snails can fortunately ‘eat on the run’, bolting down your complete tray of seedlings, quickly adopted by seconds and pudding earlier than retreating beneath the tray to digest its dinner at leisure, at the hours of darkness and hidden from predators.

 

Organic-approved slug pellets

Close up of slugs covered in blue pellets

Even organic-approved slug pellets must be used sparingly, not like this!
Image: Shutterstock

What’s in natural slug pellets and the way do they work?

Numerous manufacturers of organic-approved slug pellets can be found together with:

All of those merchandise are primarily based on ferric (iron) phosphate which is certain to a cereal-flour primarily based bait. Iron phosphate impacts the metabolism of calcium within the intestine of slugs and snails inflicting them to cease feeding and die inside three to 6 days. Any uneaten pellets will slowly break down releasing phosphate and iron which might be taken up by crops as vitamins.

Effect on earthworms

These pellets are innocent to mammals however there may be one draw back – they are often dangerous to earthworms. Alongside ferric phosphate, the pellets include chelating brokers and are consumed by earthworms which causes them to feed much less, unfastened weight and die. The energy of humble earthworms in sustaining a wholesome soil ecosystem is just not one thing to be casually dismissed, so it’s important that gardeners use these pellets responsibly.

Application

I wince after I see folks pour gluts of pellets in every single place as this actually isn’t essential – the pellets are baited and so will appeal to slugs and snails to them. These molluscs are outfitted with extremely delicate style and scent organs of their lips and tentacles which may detect minute chemical traces of their atmosphere. Slugs and snails are capable of finding potential mates by sniffing out and following mucus trails and can again observe alongside their very own scented trails to search out their method dwelling. So, if you will use natural slug pellets, accomplish that sparingly, simply utilizing 4 or 5 in an space of an A4 sized piece of paper.

 

Nematodes: The slug’s nemesis

What are nematodes and the way do they work?

Professional gardeners have been utilizing dwelling organisms to regulate pests, referred to as ‘biological control’, for a few years. They at the moment are available to newbie gardeners, and if you happen to haven’t tried them but then you might be undoubtedly lacking a trick! Nematodes are microscopic worms that are naturally current within the soil and act as parasites on different dwelling organisms. The wonderful thing about them is that they’re host-specific and so non-target species are left unhurt.

Close up of slug with swollen mantle having been infected by nematodes

Slugs contaminated by nematodes develop a swollen mantle
Image: Ion Colino – http://areitzsoroa.blogspot.co.uk/2010_12_05_archive.html, CC BY-SA 4.0, https://commons.wikimedia.org/w/index.php?curid=55026740

There are nematodes for a complete vary of pests and so they all have distinctly unpronounceable and forgettable names. Phasmarhabditis hermaphrodita is the one for slugs, conveniently bought below the monker ‘Nemaslug’. These tiny worms with a giant identify are actually the slugs nemesis. They enter the slugs physique via its respiratory pore, multiplying quickly and inflicting them to develop a swollen mantle. The sick slug instantly goes off its meals and infrequently stays underground. So, though it takes between 7 to 21 days for it to keel over and die, injury to your valuable crops is straight away decreased. Once the slug dies the nematodes tuck in and feed off its stays. They go on to provide one other technology of hungry slug-killers which journey via the soil to seek out new slug hosts.

Application and timing

Nemaslug is efficient but it surely have to be utilized accurately and timing is essential. The sachet containing the nematodes is blended into water and utilized onto the soil utilizing a watering can or backyard hose applicator. The soil temperature must be constantly above 5°C however you additionally need to apply it as early as attainable within the spring to catch the primary technology of younger slugs earlier than they flip into bigger adults that are extra immune to an infection. One utility offers as much as 6 weeks of management so, a number of functions are wanted throughout the rising season. As Nemaslug is a stay product with a shelf life, (it must be saved in a fridge on receipt), the packet features a small calender to file functions and remind you when to order your subsequent batch.

Good towards slugs however not snails

Close up of brown lipped snails on plant stems

Nematodes assault all slugs however aren’t very efficient on snails, similar to these enticing brown-lipped ones
Image: Canva

Nemaslug is efficient on all pest slug species and gray subject slugs are particularly prone which is sweet information as they’re essentially the most damaging of all backyard slugs. However, if snails are your largest enemy then Nemaslug received’t be a lot use. Although nematodes can kill snails, they have an inclination to evade an infection resulting from their largely surface-dwelling nature.

Being ugly, slimey and homeless, slugs have few followers, and appear to return in for essentially the most blame. Meanwhile the snail, with its ingenious and fairly armour, its shy ‘peak a boo’ behaviour and the truth that the shell offers a handy and dry hand maintain for curious people, has a slighter cuter repute. However, of the 30 plus species of slugs in Britain, solely 4 are actually backyard pests feeding off dwelling plant materials, the rest favor munching on useless natural matter. If you could have a limey soil, level the finger of blame at snails as an alternative. They favor calcerous soils which offer the mandatory calcium for his or her shells.

Not so efficient on heavy soils

Nemasys is more practical in freely draining soils than heavy clays, as these permit nematodes to simply transfer about and discover their hosts.

Harmless to earthworms

Nemaslug has the benefit over natural pellets in that it continues to work effectively in moist climate and quite a few experiments have demonstrated that it’s utterly innocent to earthworms together with bugs and different organisms.

 

Beer traps

Research by Garden Organic discovered that slugs get pleasure from beer however turned their tentacles up at crimson and white wines, Cava, cider, orange squash and water
Image: Shutterstock

Beer traps are a widely known conventional slug and snail deterrent however they’re a technique which I undoubtedly can’t advocate. Slugs and snails can sniff out fermenting beer from lengthy distances and might be interested in your boozy backyard usually with out truly drowning within the beer, so you might be more likely to find yourself with a much bigger inhabitants of molluscs than you began with. Meanwhile, a number of different useful bugs may even be interested in your traps and meet a sticky finish. Personally I believe it’s a waste of beer. Let’s transfer on!

Slug and snail collars

Close up of a plastic slug collar with tomato seedling inside

Slug collars seem to disorientate some, if not all, slugs
Image: Thompson & Morgan

Slugs and snails aren’t outfitted with a lot in the best way of brains, as an alternative they’ve ‘ganglia’ – mainly bundles of nerve cells – which can clarify why they’ve a tough time negotiating these plastic collars. When they attain the overhanging lip these simple-minded molluscs get confused by this obvious ‘dead end street’ and fail to search out their method to your tasty crops. There are undoubtedly some molluscs on the market with a greater sense of course, so it isn’t a 100% idiot proof answer, but it surely avoids this use of any chemical substances and requires minimal effort. Although I believe their look is unsuited to the decorative backyard, it is a low-cost and simple method to defend your tender stemmed vegetable crops.

 

Slug and snail management: A navy technique

Use a mix of strategies

In the struggle towards slugs and snails it pays to have a co-ordinated technique, using your entire cultural, chemical and bodily methods to defeat these resilient backyard adversaries. Don’t depend on simply one of many strategies above, which all have their benefits and downsides, however use them in tandem. Use an early utility of nematodes to guard susceptible root crops, similar to potatoes, throughout a large space of floor. Apply Grazers to leafy veg similar to brassicas. Meanwhile, defend your ornamentals with Ferric phosphate and wool pellets.

Grow your seedlings on

Grow seedlings on till they’ve reached an inexpensive measurement and their stem and leaf tissues have toughened up a bit earlier than planting them out. Greenhouses can shortly get too scorching in spring sunshine even when the ambient temperature is chilly. Seedlings raised in excessively heat situations develop very tender and leggy – good meals for slugs and snails. Ventilate your greenhouse as a lot as attainable to maintain temperatures at an inexpensive stage and harden off seedlings in a slug-protected space (see beneath) earlier than they go outdoors.

Concentrate your efforts

Pay especial consideration to your nursery areas the place seedlings and younger crops are positioned and focus your efforts on these zones, utilizing Ferric phosphate pellets sparingly to guard them.  Reduce any hiding locations in these areas by maintaining them tidy and eradicating particles and leaves. Pay consideration to crop margins that are adjoining to close by cowl similar to hedges or lengthy grass.

Check your seed trays

Slugs and snails love to cover beneath seed trays and pots so test beneath them on a regular basis.

Don’t use excessive nitrogen fertilisers an excessive amount of

Slugs and snails will go for tender juicy development which is strictly what excessive nitrogen fertilisers promote. Aim as an alternative for sluggish, regular development. Where essential use natural slow-release fertilisers or specialised feeds similar to Chempak Low Nitrogen (good for firming up greens and susceptible crops similar to lupins and delphiniums), or Chempak High Potash (to encourage flowering reasonably than leaf and stem development).

Water within the morning

This will allow the bottom and foliage to dry out earlier than foraging molluscs come out at night time.

Be vigilant throughout moist climate

After each bout of rain test and renew your slug and snail defences the place essential.

Encourage wildlife

Close up of a thrush with a snail in its beak

Slugs and snails are a essential a part of a thriving ecosystem. Look after your allies within the struggle towards them
Image: Shutterstock

All of the animals listed beneath eat slugs and snails, so it is sensible to recruit them as your allies. Our wildlife gardening guides present loads of suggestions for encouraging them into your backyard.

  • Hedgehogs
  • frogs
  • toads
  • newts
  • slowworms
  • birds
  • floor beetles
  • centipedes
  • shrews
  • mice

Avoid the crops most susceptible to slugs and snails

Close up of blue, white and mauve delphinium flower spikes

Sluggish gardeners who don’t have the vitality for a struggle towards gastropods could favor to keep away from prone crops similar to these delphiniums
Image: Canva

If slug and snail warfare isn’t your factor, then don’t hassle with the crops listed beneath :

  • Beans
  • Celery
  • Clematis
  • Dahlia
  • Delphinium
  • Doronicum
  • Gerbera
  • Helenium
  • Hollyhock
  • Hosta
  • Hyacinth
  • Lettuce
  • Lilies
  • Lupin
  • Pansy
  • Peas
  • Potato
  • Primula
  • Soloman’s Seal
  • Sweet peas
  • Tulips


Slugs and snails are right here to remain!

Close up of slug coming out of the spout of a watering can

Molluscs have been round for 500 million years, which has given them ample alternative to good the artwork of annoying gardeners
Image: Canva

There is not any method of utterly eradicating slugs and snails and if we might, our gardens can be in a horrible mess. Slugs and snails are major customers, munching via natural matter, fungi and algae and making it obtainable to smaller organisms. Without them, we might actually be surrounded by garbage. Think of them as one in all nature’s dustmen, indiscriminate however environment friendly. They additionally kind an vital a part of the backyard eco-system, offering meals for all types of animals. Concentrate your efforts on younger seedlings and essentially the most susceptible crops, and settle for that slugs and snails will at all times love your backyard as a lot as you do!

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