"Encouraged by food placed within the trap, beetles and other insects would climb up the ridged sides of the trap and fall into the hole in the centre. Here they would become trapped. As the inside is smooth, they would not be able to climb out again."
Maker: Beetle Trap Company, London, Greater London, England, United Kingdom.
From the Wellcome Collection, via A London Salmagundi.
And being chemical free, there's little chance of developing resistance, short of sticky feet or a good hop.
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