"Chief McGee" wrote in message news:%8OYc.72808$9d6.70587@attbi_s54...
"Bob Engelhardt" wrote:

But the bait isn't actually _in_ the trap - it's underneath. Once a fly
is _in_ the trap, it can't lay it's eggs in the bait. Bob

If the purpose of the bait is to smell bad. Can you put a piece of screen
over the bait cup. This would let the odor out, but not let the flies in to
lay eggs.

After re-reading the instructions I finally see what is being
suggested. The trap merely sits over the bait cup. He doesn't mention
adding a screen over the bait cup but that would be a trivial
addition. Interesting that the trap does not catch the flies on their
way to the bait but only as they try to leave the bait or as they
search the area around the bait.