Pink Bollworm.--Insecticides used for bollworm control were also 
effective against the pink bollworm except in one check field treated 
with endrin. Infestation counts were made biweekly. The records 
were negative until the last of July, and the late buildup in infestation 
was negligible from the standpoint of crop yield. As green bolls de- 
creased in number, becoming scarce at the end of the season, the per- 
centage infested increased rapidly, but the few damaged bolls caused 
no appreciable reduction in yield. 
The infestation records are shown in table 2. Although the percent- 
age of bolls infested was slightly lower in the trap area, this difference 
cannot be attributed to control by light traps. Scarcity of green bolls 
was the major cause of the very rapid increase in percentage of bolls 
infested in the last two counts. Consequently, variation in number of 
bolls present resulted in some difference in infestation between fields. 
Fields 4 and 5 in the light-trap area had more green bolls, and although 
the boll infestation did not reach 100 percent, they had higher larval 
populations per acre than some of the other fields. In field 5 of the 
check area the lack of any insecticide effective against the pink bollworm 
and the fact that green bolls became scarce exceptionally early caused a 
rapid and early increase in the percentage of bolls infested. 
The pink bollworm infestation did not vary appreciably with the 
distance from the traps. The seasonal average percentages of bolls 
infested at 100, 450, and 800 feet from traps were 33.4, 30.7, and 33.6, 
respectively. 
These field observations confirm the cage-experiment evidence that 
the light traps were of no appreciable benefit in pink bollworm control. 
Vegetable Crops 
Personnel stationed in the area during the summer left at the end 
of the cotton-growing season. Surveys on vegetable crops grown during 
the fall and winter months were made periodically from October through 
December by personnel making brief visits from Brownsville. The 
crops observed during this period consisted of broccoli, brussels sprouts, 
cabbage, cauliflower, and lettuce. Insecticide applications were made 
for control of disease-carrier leafhoppers as well as the Lepidoptera 
that might be attracted to light traps. The insecticides were used about 
equally in the trap and check areas, the number of applications ranging 
from 3 to 6. The cabbage looper (Trichoplusia ni (Hbn.)) was the major 
pest observed and the only one for which counts were made. Six or 
more fields were inspected in each area. 
From observations made on October 7 it was apparent that the light 
traps were not controlling the cabbage looper, although infestation 
records were not obtained in check fields at that time. It was learned 
that this insect had been destructive in the light-trap area for the past 
month and some fields had received four insecticide applications. In 
one field of young lettuce 18 eggs were found on 25 plants. 
