24 
BULLKTIX L39T. U. S. DEPARTMENT OF AGRICULTURE 
ton zones of limited size were established where infestation has been 
observed. In the scouting in the vicinity of these zones 28 fields 
were found infested in 1920, i in 1921, and none in 1922 or 1923. 
The clean-up operations were conducted in each of the vears except 
1918. at a total cost of $219,266.08. 
In the Big Bend district the first infestation was found in the 
crop of 1918. and was evidently caused by the bringing in of cotton- 
seed from the interior of Mexico. Twenty-one fields, including some 
in Mexico, were found infested, all of which were cleaned up. A non- 
cotton zone was maintained there in 1919 and 1920. The infestation 
has continued, evidently owing to reintroduction of the insect from 
Mexico. The infested fields numbered 12 in 1921, 24 in 1922, and 
33 in 1923. In 1921 and 1923 a part of the infested fields enumerated 
were in Chihuahua, Mexico. The Pecos Valley also was first found 
infested in 1918, to the extent of nine fields, as a result of the car- 
riage of seed cotton from liig Bend. The area was cleaned up in 
1918 and 1919, but no noncotton zone was established. Infestation 
has recurred in 1919, 1920, 1921, 1923, and 1924. Much labor has 
been expended in scout work. 
Table 2. — Number of man-days scouting and number of infested field* in each 
infested district for each crop to June 30, 1925 
1917 
1918 
1919 
1920 1921 
1922 
1923 1924 
District 
a 
'a 
si 
C/2 
V 
a 
es 
3 
•a 
.2* 
*5 C 
1 
V 
a 
a 
8 
cS 
V 
a 
a 
X) 
.2 m 
V 
a 
2 
« <D 
i 
a 
a 
9 S 
>> 
c3 
I 
a 
8 
X3 
.2 m 
en 
1 
T3 
C 
03 
T3 
CO 
o <» 
"5° 
Texas: 
164 
s 
471 
829 
4 
555 
103 


5 


111 


121 
9 







30 


30 
650 
1,796 
0) 
1, 123 
158 


104 
46 

57 
3,727 
1.50 
57 

51 
1 
1 



22 



53 
22 

75 
505 
2,006 

?8 
369 
1,518 
22 
299 
78 
798 
340 
319 
320 
?7 

1 
i 12 
21 
9 
5 
2 


*6 
4 
53 
172 
891 

255 


•36 
5 
1 






42 


42 

1,030 
167 
631 
397 
835 
612 
655 
744 
260 
695 

Trinity Bay. 
645 15fi 
1. 225 










809 


809 









161 


161 

859 15 
339 14 


27 24 66 
6? 
Pecos Valley ... 
386 
261 4 
671 
461 
632 
332 
421 
406 
740 
611 
718 
648 
?31 
15 
El Paso Valley.. 
1 


Louisiana: 
213 
486 
240 
310 

10 
2 5 


New Mexico: 
77 
282 
2 1 

Carlsbad 
2 63 
583, 430 
10 639 
61 84 
74 4. 153 
i) 1,212 
29 3. 724 

Totals: 
Texas 
1,902 
5 
111 
3, 729 
699 
521 
?, 881 
3,672 
1, 399 
955 
78 
Louisiana 
964 01,366 
7 347 


60 
Total 
2,078 
3, 934 
4,949 
4,192 
29 6. 533 
6 026 
78 
i In 191K. 1921, anil 1923, some of the fields enumerated under the Big Bend district were in Chihuahua, 
Mexico, but are here counted as being in Texas. In 1919 only a fraction of a man-day was devoted to scout- 
ing, and is not enumerated. 
2 In 1920, 1921, and 1922, a part of the fields here ascribed to the Mesilla Valley district were in El Paso 
County, Tex., and the totals by States are adjusted accordingly. 
The infestation in the Cameron Parish district was discovered in 
1919. There has never been any very satisfactory determination 
of its origin, but it is probably connected with the infestation in the 
Trinity Bay area. Twenty-two fields were found infested. A non- 
cotton /one was maintained effectively during the two following 
years and there has been no recurrence of the infestation. The area 
was cleaned up in 1919. 
