Essentially all you need is something yellow, weather resistant and sticky with a decent surface area. The whiteflies are attracted to bright yellow and orange.
We found some plywood frog cutouts at the last hard waste collection as well as some yellow enamel paint. I combined the two with a spike made from some broken garden lattice.Obviously it will still work if its a plain old rectangle but I had the frogs so why not make them ornamental?
I tried painting used motor oil onto them to act as a sticky surface but it wasn't particularly sticky, it ran down it and was a bit dark. Smearing it with an old pot of vaseline based lip balm worked a treat as pictured.
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