Corn 
A rather large acreage of field corn was grown for producing hybrid 
seed. A small acreage of sweet corn was also grown, but was elim- 
inated from the infestation counts since it had been treated with insec- 
ticides. Infestation records on the corn earworm (Heliothis zea (Boddie)) 
were obtained from fields where no insecticides were used. A 100-ear 
sample was examined from each field, and eight fields were sampled in 
each area. The counts included the fall armyworm (Laphygma frugiperda 
(J. E. Smith)). 
The light traps did not give any control of the corn earworm. The 
infested ears averaged 99.5 percent in the light-trap area and 99.3 
percent in the check. The respective average numbers of worms per 
100 ears were 255 and 237. 
Cotton 
Cotton was the major crop grown during the summer and produced 
about two bales per acre in both the trap and check areas. Growers 
applied insecticides about equally in both areas. The number of appli- 
cations in the different fields in the trap area ranged from 7 to 10 and 
averaged 8.4, and in the check fields ranged from 6 to 11 and averaged 
8.8. Bollworm and pink bollworm infestation records were obtained 
from five fields in each area, and in the trap area the counts were made 
at points 100, 450, and 800 feet from each of nine traps. These points 
were marked by stakes permanently set up for guidance in the sampling 
procedures. Boll weevils and other insects were of minor importance. 
Bollworm.--The insecticides used were applied primarily for con- 
trol of the bollworm (Heliothis zea (Boddie)). Weekly records from the 
middle of June through the third week of August (table 1) show a heavy 
infestation as indicated by abundance of eggs, but indicate that insecti- 
cides reduced the larval population so as to prevent appreciable crop 
damage. The light traps appeared to be of no benefit. Bollworm eggs 
were most abundant during the week ending July 23, when the number 
per 100 plant terminals averaged 95 in the trap area and 78 in the check. 
The respective seasonal averages were 30.6 and 29.6. The weekly 
average number of young larvae per 100 plant terminals never rose 
above 2 in the trap area or above 1.2 in the check, and the seasonal 
averages 0.64 and 0.52. 
There was no significant difference in the seasonal average infesta- 
tions at various distances from traps. At distances of 100, 450, and 
800 feet the numbers of eggs per 100 plant terminals averaged 26, 31, 
and 34, and the number of young larvae 0.5, 0.7, and 0.8. 
