similar trap been around a long time
the principle for both is the flies are drawn to the black surface.... their first instinct is to fly straight up after landing
I have seen beach balls painted black with a skirt of white plastic held in place with a hoola hoop at the bottom... then a funnel into a catch basin at the top.
Like the one you show above I have heard of spactacular catch stats.
Only works with horse deer and cow flies.... Thank goodness we have very very few here in San Diego.
Link to a commercial product
https://www.h-trap.com/
But the Tray one would catch so many more....
deb
PS then there is the hillbilly version![]()
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$295 for that "Commercial version"
ouch.
How do you get the horses to wear the hats?
