The pitfall trap is an adaptation of of hunting techniques that dates back to primitive man. It consist of a plastic cup with a funnel, a hole is dug in the ground, the trap is sunk into the soil and the mouth is level with soil surface. Many ground dwelling spiders as well other arthropods fall into the trap and are enable to escape. In this study we used preservative fluids, in this case ethylene glycol (antifreeze). Traps were operated all time for two consecutive years in pecan orchards.