14 
and cottonseed are killed during the processes of ginning and oil-mill 
delinting of the seed. One heavily infested sample of snapped cot- 
ton containing 5SG live pink bolhvorms to the pound of seed before 
ginning contained only 11 after normal ginning, 0.6 after the first 
cut of linters, and none after the second cut of linters. These experi- 
ments showed that ginning killed 98.1 percent, sinning plus first 
cut of linters 99.9 percent, and ginning plus first and second cut linters 
Jim i percent. No live larvae 1 were found in the lint or linters. 
Cage tests determine pink bollworm emergence from gin waste 
Gin waste collected from gins in several west Texas counties late 
in 1952 was placed in emergence cages at Lubbock. Up to July 3, 
L953, pink bollworm moths had emerged from this waste as follows: 
8 per 100 pounds of gin waste from Tom Green County. 3 per 100 
pounds from Hockley County, and 262 per 100 pounds from Pecos 
County. No moths had emerged from gin waste collected in Lubbock, 
Gaines, Garza, and Crosby Counties. 
Late-season combined pink bollworm and boll iceevil treatments 
effective 
Late or mid-season field-scale experiments in the Lower Rio Grande 
Valley and Coastal Bend areas of Texas showed a pronounced in- 
crease in cotton yield from pink bollworm and boll weevil control, with 
the greater increases from pink bollworm control. Highest gains 
were obtained in the Lower Rio Grande Valley, when unusually heavy 
infestations occurred. In three experiments boll weevil control treat- 
ments resulted in seed cotton gains over untreated checks that ranged 
from tS7 to 471 pounds per acre, for an average gain of 251. In five 
experiments the gain from treatment for both insects over treatment 
for boll weevil alone averaged 672 pounds per acre, ranging from 
349 to 1,069 pounds. 
DDT applied at the rate of 4 pounds per acre every 14 days gave 
only slightly less pink bollworm control than 2 pounds applied at 
7-day intervals. The addition of EPX to DDT increased control of 
the pink bollworm, gave satisfactory control of moderate boll weevil 
infestat ion. and helped suppress spider mite and aphid buildup. Even 
the most effective insecticide treatment did not eliminate all damage 
by pink bollworm. In some of the experiments there was considerable 
damage. Because of the extremely heavy infestation in 1952, much 
better control undoubtedly would have been obtained if the treatments 
had been started earlier. 
In randomized small-plot experiments, DDT mixtures containing 
EPN, toxaphene, dieldrin, or endrin were effective against both the 
boll weevil and pink bollworm. Of the new insecticides tested CS-708 
gave Sufficient pink bollworm control to warrant further field trials. 
Metacide, endrin, and nialathion did not show much evidence of 
control. 
Lighi traps may assist in pink hollivorrn detection and control 
Preliminary work with black-light and mercury-vapor lamps for 
attracting pink' bollworm moths showed Sufficient promise to justify 
further investigations. Il Was noted incidentally that the lights also 
attracted Large numbers of such other lepidopterous insects as the 
bollworm, the cotton leai'worm, and cutworm moths. These traps 
