Believe it or not, the active ingredient in some of our favorite beverages is deadly to snails and slugs. It acts as a neurotoxin for mollusks. Applying caffeine to soil will get rid of your slug problem. A 4 oz solution with 2% caffeine applied to 4 square inches of soil takes out 92% of the slug population in 2 days. Also, when caffeine is added to pests’ food, it becomes inedible. Both slugs and caterpillars avoid leaves that have been sprayed with caffeine. These same tests also concluded that caffeine is not effective for killing frogs.
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