I live amongst cattle so we have lots of flys. The bought designs have a few problems.
1. Not large enough, they completely fill within weeks or days of flys.
2. They dry out, too small a volume and the bought designs do not condense the evaporation and reuse the moisture.
The solution is a result of a accident and time. My last fly catcher has begun working again more than 12 months after setting it up.
What you require
1. Two 2 litre soft drink bottles (straight sides not shaped like a coke bottle)
2. Box cutting knife (stanley knife)
3. Inch wide clear tape.
Cut the top off one bottle leaving 15-20mm of taper. Throw away the top.
Cut the bottom off the 2nd bottle at the point of the maximum diameter.
Cut the top off the 2nd bottle at the point of the maximum diameter.
Join bottle 1 and 2 together with tape (taper on bottle 1 should help)
Turn the top of bottle 2 upside down and force it into the top of bottle 2 (place smelly food inside if this can't be pushed through the small opening. Dead flys from a functioning fly trap works best but don't get it on your hands).
Drill a small hole in the opposite side to install a screw or hook later.
Place starter powder into the fly catcher.
Attach to post or hook through the hole.
The reason it works
The large storage of water (2 litres) and the funnel that condenses and returns evaporated moisture to the storage means it can be up to 1 month before water needs to be replenished. Also the join with the sticky tape is not water tight and if it rains (over winter) the container will drain and continue to function.
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