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Pests and diseases - Slugs and Snails

Signs
- Irregular holes are eaten from leaves, slime trails
often left around the plants on the soil and the leaves
Damage - Young plants and seedlings are particularly
vulnerable and can be stripped bare or eaten down to the ground. Particularly fond
of Hostas and Delphiniums.
Treatment
- Treatments abound for slugs and snails so there's no choice
of options to try. My own personal approach is to not grow anything that they like
eating apart from Delphiniums because I love Delphiniums. When the new shoots are
emerging in the spring I scatter mini slug pellets around them and stop when the
leaves are large enough to be less tasty to the slugs.
These animals feed mainly at night so if you are particularly
bothered, you can go out and manually pick them off those plants most under attack.
Rings of material that is uncomfortable to cross such as sharp
grit or broken egg shells will sometimes discourage them, I did see an experiment
on this though on a gardening programme and they happily crossed everything in their
path.
Plants in pots can be protected by greasing the rim with Vaseline
and salt.
An old remedy to deter snails and slugs is to collect as many as possible, morning
and evening. Tip them into a bucket of boiling water and let it stand for
a few days until the smell becomes fearsome, then strain off the liquid and use
it to sprinkle round vulnerable plants, such as the young growth of delphiniums,
lettuce and so on - but not on them. The remains of the slugs and snails can also
be scattered.
Sprinkle slugs with salt to kill them
(if you can stand the resulting agony).
Trap them using
containers in the ground, slightly propped up pie tins or plant pots that have various
baits in them though you still have to get rid of them which can be a problem if
you don't hate your neighbor. Suggested baits:
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Empty grapefruit
halves, lemons and oranges also work too, but grapefruit are best
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Beer - the slug-pub
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Yeast, mix some
with water and a bit of sugar
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Potato cut in half,
placed cut half downwards
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Damp dog food
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You can deal with your captured slugs and snails in a number
of ways according to taste. Placing them out for the birds
may work, but the slugs and snails invariably make a run for it so some escape.
Another way to deal with your captured slugs
and snails (I haven't tried it myself - the wife won't let me) is to put them in
a plastic Tupperware type container and then put them in the freezer. This
is probably the most humane way as they just slow down and become torpid in the
cold being cold blooded (yes they do have blood of sorts). So they are effectively
anaesthetised before being frozen, put the carcasses on the compost heap.
Plastic bottles.
Take a 1.5Ltr or 2Ltr clear plastic bottle and cut off the base with scissors. Remove
the stopper and place over a single plant. A simple but effective way of protecting
tender plants from slugs or the weather.
Go out to the garden in the late afternoon and lay boards or pieces
of cardboard on the bare soil around your plants. In the morning turn the boards
over and scrape the hiding slugs into a large yogurt or cottage cheese container.
Animal control, ducks, chickens, frogs, toads and turtles
all eat slugs and snails and can be used in a fenced yard or greenhouse as appropriate.
Another option is to go for biological control. Biological
control of a pest relies on introducing a predator species so "fighting nature with
nature", if chosen carefully, the predator will stop damage to your plants without
damaging the environment. Such biological controls are safe for the user, children
and pets. They will not harm other beneficial garden insects and are biodegradable.
They do rely on the predator always
having some food though, or they will die out, so like other organic practices it
is a question of maintaining a small population of pests to allow the predators
to be ready for them, in this case though the balance is skewed away from the problem.
For slugs and snails, the biological
control is a Nematode worm sold as "Nemaslug". The nematodes
aggressively search out and attack slugs. They enter the slugs body through a hole
behind their heads (the pulmonary aperture that they breathe through to be precise).
Once inside they release a bacteria which stops the slug eating. The nematodes then
start to reproduce inside and within 7-10 days the slug is dead. The nematodes continue
to reproduce as the body breaks down. This new population enters the soil and searches
out new slugs to attack. This is a natural, non-toxic product that is safe for both
users and wildlife. The nematodes stay active for 6 weeks so a single dose protects
plants when they are emerging in the spring and are most vulnerable.
Nematodes can only be
used in late spring and summer when the soil has warmed up (to above 5°C). On heavy,
waterlogged clay soil, the nematodes can find it difficult to move, so Nemaslug
can be less effective in these conditions.
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Reasons to like slugs and snails:
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 | Go and look at them out in the garden
after the rain has fallen and it's warm. Watch them as they glide
elegantly and effortlessly with their eye stalks and feelers moving
this way and that and try not to be impressed. |
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 | There's something noble about
the way that they face the world, completely vulnerable with
their soft bodies, unable to move quickly, not very aware of their
surroundings and unable to do much to defend themselves other than
retreat to a very thin shell or just cower in the case of slugs.
Then again I suppose, compared to being able to see the bird that
was going to eat you but not being able to do anything about it,
- blissful ignorance is preferable. |
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 | In historical times slugs and snails
provided an excellent source of protein for the impoverished.
Sometime unfortunately the poor widow with healthy strapping children
living in a village with otherwise sickly children (with less resourceful
parents) would be decried as a witch. |
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 | Centuries ago people believed in spontaneous
generation. Meat spontaneously turned into flies if left, cheese
into mould for instance. Well I reckon that modern science has overlooked
this theory as far as slugs and snails are concerned. Soil in
the presence of plants spontaneously generates slugs and snails.
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 | Snails of course as we all know are an attempt
by a well meaning angel to cover up the fact that God made slugs
when he wasn't paying proper attention. "I'll give them a little
house, that'll make them look cute and then people will love them.........".
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 | They provide food for thrushes, hedgehogs
and many other animals. |
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 | No matter how much you think
you like Hostas, slugs and snails will always have a deeper appreciation.
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 | Slugs secrete an anaesthetic, Native Americans
used to suck on a slug when they had a toothache - so now you know
what to do next time, probably works with mouth ulcers too.
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