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there must be some sad creature out there that looks on cockies as a feast... make friends with them :p
i imagine the smaller german cockies won't be any different... i'll try this one. i have tried something similar before for ants, using borax, sugar and various other tempting additives... never had too much success though. ants seem to have differing tastes or are simply crafty
i have heard of D E but never found any locally, it's highly recommended for fleas as well, always an accompaniment with 'mans best friend'the method of action of D E is particularly devilish guaranteeing a slow miserable termination :(
that's not a silly idea... :) however i love the idea of a device like the one the OP constructed, so simple but 'prof brainstorm'ish'... lol
Btw i wasn't thinking of a 'humane' release for cockroaches...
here in australia we have a big problem with cockroaches... i'm sure there's a simple solution lurking in here somewhere to catch the dirty little b***ards using a drinks bottle or similar ? obviously gravity won't be the key, maybe friction (or lack of)... ?