Three later surveys, made on October 25, November 17, and 
December 20, showed a decrease in the infestation, with no benefit 
from the light traps. Very little insecticide was used during this 
period. In each of the three surveys the largest numbers of larvae 
and eggs found on a single 100-leaf sample were in the light-trap area. 
The respective average numbers in the trap and check areas were 2.8 
and 1.8 in the first, 2.3 and 2.8 in the second, and 3.0 and 1.4 in the last 
survey. 
Other insects were of minor importance. In the October 7 survey a 
light infestation of the corn earworm was noted on all crops, and a few 
small flea beetles were causing slight damage. 
Indicator Traps 
The insects from four traps were examined to determine the seasonal 
abundance of certain species. These traps contained single lamps 
identical to those in the insect-control experiment, but instead of the 
electric grid they were equipped with baffles and a killing can for col- 
lecting the insects (fig. 2). Three of the traps were in the trap area, 
replacing three of the grid type, and the fourth was located in the check 
area. It was thought that probably the three in the trap area, competing 
with other traps, would catch fewer insects than the one in the check 
area. The numbers caught were recorded for six species, a mixed 
group of cutworms, and a group of Protoparce spp. (hornworms). The 
sex ratios of Heliothis zea, Protoparce spp., and cutworms were deter- 
mined from a catch in all traps at least once each week. 
The belief that a greater number of insects would be caught per 
trap in the check area than in the trap area did not prove to be true. 
The numbers of bollworm moths taken during the season from the trap 
area were 22,631, 17,043, and 33,709 compared with 16,081 from the 
check area. The numbers of pink bollworm moths were 4,730, 1,624, 
and 24,978 from the trap area and 1,096 for the check. 
The numbers of specimens of the various species caught in the four 
traps are tabulated for biweekly periods in table 3. The number of 
bollworm moths increased until a peak was reached the last of July, 
which was in direct correlation with the infestation records obtained. 
Pink bollworm moths did not appear in the traps until the last part of 
July and were not caught in large numbers until green bolls became 
scarce. Female bollworms outnumbered the males, but the reverse 
was true of the cutworms and hornworms. 
