The cotton wool also stops loopers and ants,but be sure to keep it dry or use the waterproof type ,it must stay fluffy.
I also use copper foil in strategic places ,as slugs and snails do not like crawling over copper . I got this idea while watching a program on tv about snail farming. They breed them in tanks which have copper strip around the top to stop the horrible things from escaping. I also go around at night with my headlamp on collecting them in a bucket for feeding to the birds in the morning!
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