Step 7Truck trap
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One really good lure for deer flies is a warm, dark moving vehicle. I put a sticky salad bowl trap on my pickup truck, and it will just about be covered up with dead flies during a season. The bowl is connected to a plastic 90-degree elbow on top of plastic pipe. A long sheet-metal screw runs through a hole in the bowl and into the elbow, with a short, light compression spring above and below the bowl on the screw. Good movement when the truck is in motion. There is a pin through the lower end of the mounting pipe, and it fits into a groove in the top edge of a slightly larger plastic pipe.