The experiments described here were designed to use light traps as a means 
of investigating the numbers, habits, and movements of hornworm moths and to 
test the possibility that such traps might be used to reduce populations in 
large areas. The work was done near Oxford, N.C., in 1961-62. 
DESCRIPTION OF TRAPS 
Both bait and light traps were used in these experiments. The bait traps 
were of the type described by Scott and Milam (1943). They were screen cages 
3 feet high, 3 feet long, and 2 feet wide. The ends consisted of a shallow 
funnel with an 8-inch hole opening inward. A screen baffle was hung from the 
top of the trap between the two openings to prevent moths flying straight through. 
Each trap was equipped with a vial containing iso-amyl salicylate dispensed by a 
cotton wick that projected about an inch from the container, which was placed 
near the ground in the center of the trap. Half the traps were also equipped 
with a piece of fiberboard 4 inches square impregnated with the bait and attached 
to the top of the baffle on June 14. Twenty-five of the traps were old ones that 
had been used in previous years and 37 were new. There was no evidence that 
differences in traps affected the catch. 
One of the light traps used in 1962 is shown in figure 1. The attractant 
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Figure 1.--Light trap used in 1962. 
was a 15-watt black-light fluorescent lamp, which radiated primarily between 
3,200 and 4,000 angstroms with a peak emission near the center of this near- 
ultraviolet region. Moths flying toward the trap hit the baffles or dived into 
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