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I should go on record as saying I tried other designs with no success. The trap in the image below was designed to mimic some small Czech-designed traps we bought, the idea of the wooden frames was that it would keep the cloth taught, and all the cloth to be replaced every year or so without the need for sewing.

For reasons I do not really understand, except maybe that the small Czech traps are no good in open areas it did not work at all(they worked well at Ramna, middlingly at Farfara and poorly at Stratiom - suggesting again how important trap location can be - but I did get to compare them directly with a full malaise by changing from one to the other at the Cafe Elodia site, and they catch a lot less). Strangely this trap also collected water, somehow the bottle food fill up during the week, even if it didn't rain, I have no idea why, but I suspect the wood had something to do with it.