I have two other fly catchers for Fruit Flies mostly.  I think that maybe the reason this did not work so well is that the others I have work so much better.  The others I have are the one that looks like a Glass multicolor beehive and the smaller that looks like a small plastic peach.  The best one is the one the glass one.  Even the one I made with an old pill bottle works better than this.  None of the others except for one uses any poison.  I added liquid Nicotine to one which did increase the kill rate some.