02 BTKLETIX 91S. U. S. DEPARTMENT OE AGRICULTURE. 
Table XXYIII. — Weekly examination of bolls from poison experiments: Average num- 
ber of larcx per boll. 
Week endins- 
Tlahualilo. 
San Isidere 
Zaragosa. Small experiment. 
| 
Poison. Check. I Poison. Check. Poison. Chec 
Lerdo. 
Poison . Check 
Aue. 2 . 
Aug. 9 . 
Aug. 16 
Aug. 23 
Ans. 30 
Sept. 6. 
Sept. 13 
Sept. 20 
Sept. 27 
Oct. 4.. 
Ocr. 11. 
Oct. 18. 
Oct. 25. 
Oct. 31. 
0-05 
0.13 
.11 
.09 
.26 
.23 
.31 
.35 
.o< 
.88 
1.2 
.86 
1.8 
5.10 
1.83 
1.50 
1.45 
5.10 
0. . / 
6.90 
6.40 
S.40 
7.60 
S-10 
7.20 
5.50 
S.70 
9. SO 
0.6 
.6 
.42 
.88 
1.2 
1.7 
2.3 
3.2 
1.2 
2.4 
4.0 
4.2 
6.0 
3.9 
0.66 
.44 
.46 
.32 
1.6 
3.0 
2.6 
2.6 
1.1 
3.4 
4.5 
5.0 
5.7 
4.0 


.02 
.04 
.02 
.14 
.20 
.25 
.27 
1.50 
3.70 
5.50 
S.00 
7.00 



.05 
.03 
.06 
.10 
.14 
.28 
2.30 
3.0 
5.30 
a 
.so I 
3-50 
4.34 
4.15 
2.8 
4.6 
6.2S 
.43 
5.70 
0.62 
.80 
3-88 
3.14 
3.52 
2.7 
4.S 
5.S4 
Weekly examinations of bolls both from the poisoned and check 
plats were made. The average number of larvae per boll varied 
slightly. These variations, however, occurred .in other samples of 
bolls where no poison was used and the poisoning did not check the 
infestation. The season of experiments was unfavorable for poison- 
ing experiments. There was about twice the normal rainfall, which 
washed the poison from the plants, and. moreover, caused the cotton 
to grow so rank that it was impossible to get a thorough application 
with the available labor. Under more favorable conditions it is pos- 
sible that better results might be obtained. 
TRAPS. 
Tilap Lights. 
In the laboratory, where the doors and windows were screened and 
the moths could not escape, they would frequently come to the elec- 
tric lights, resting on the shade or wall near by. but under outdoor 
conditions moths would seldom come to lights. Acetylene and elec- 
tric lights were suspended repeatedly in front of a white background 
in the laboratory cotton plats, where there were thousands of moths. 
In the course of 2 or 3 hours not more than 6 to S moths would 
come to the lights, while at the same time an examination with a 
flashlight would show there were large numbers on the plants only a 
few feet away. The few that did come to the lights were probably 
ones that we disturbed in moving about, and it can not be said there 
was any attraction whatsoever to the lights. 
An electric trap light was also placed within a few feet of the plants, 
with negative results. Another trap light was run all night for. 15 
consecutive nights in an open shed where there were hundreds of tons 
of seeds and only 5 moths were taken. During the same 15 nights 
