Most of us at some point, have used slug pellets to control slug and snail numbers in our gardens and allotments. Although this method seems to work, often the next day you’ll find many dead slugs scattered across the ground. It only scratches the surface of the problem. Firstly we must understand what we are up against. Any 1-metre square patch of ground may contain between 100-250 individual slugs. A dozen or so dead slugs the day after the assault is a superficial victory.
Another problem with the use of chemical control such as the traditional blue slug pellets (Metaldehyde) on our allotments is the problem they present to other friendly garden dwellers. Many predators that eat pelleted slugs will die or become very sick. This has led to a worrying drop in the amount of natural slug and snail predators in the UK.
When slug and snail number get out of control, I tend to reach for organic slug pellets. Ferric Phosphate-based pellets are a very effective treatment. They will permanently shut down the slug’s digestive system. This will result in a loss of appetite and eventual death. There are a number of advantages to using this method. Firstly, this will only affect snails and slugs and is not toxic to any other creature. Secondly, the slugs usually bury themselves, so no dead bodies to deal with. Also, Ferric Phosphate will actually feed the soil.
The only negative thing about using Ferric Phosphate is that they are so effective, that there will be very few slugs left for other predators to feed upon. I tend to only use them for population control.
Our slug and snail populations are rising in the UK as their natural predators decline in numbers. So a good step in the right direction is to encourage the predators back into our gardens.
Beer traps have been used a lot in the past, although they do require quite a lot of work – emptying and refilling should be done every few days or so. Also, in order for this method to be effective, you should place 1 beer trap per square metre of ground.
As mentions before, slugs don’t like dry conditions. I have recently observed that they even re-use their old slimy tracks to travel around to conserve against loss of moisture – life or death to a mollusc. A good method for limiting slug damage is to create ‘dry areas’ around your most vulnerable plants. The application of a good layer of rough or dry material should put even the hungriest slugs or snail off its lunch:
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