Abstract
A reported technique for using water pans to determine efficiency of backlight (BL) traps was modified for studies of Conoderus falli Lane. In tests during 1969–71, the effective radius of a 15-watt BL lamp in a survey-type trap conforming to Entomological Society of America standards was estimated at 17–23 feet. The average efficiency of the trap in capturing insects within the effective radius was estimated at 28–62%. When isolated BL traps were operated 36 to 44 nights, no effect on the population could be attributed to distances beyond 35 to 53 feet from the light. It is estimated that at least 5 traps per acre would be required to cause a marked reduction in natural populations of southern potato wireworm.
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