THE PIXK BOLLWOKM 25 
In the Shreveport district 10 fields were found infested in the crop 
of 1920. a result of seed shipped from the Cameron district prior to 
the discovery of infestation there. A noncotton zone was proclaimed 
in 1921 and continued through 1922, and there has been no recurrence 
of infestation. The area was cleaned up in 1920 and again during 
1922 and 1923. 
In the Mesilla Valley in Xew Mexico 5 fields were found infested 
in 1920. A clean-up campaign was begun, but it was discontinued 
when the extent of the infested territory in this district and in the 
adjoining El Paso district was determined. The infestation has 
continued. 
In the El Paso Valley 14 fields were found infested in 1920. A 
clean-up campaign was begun, but it was discontinued on account 
of the general infestation in this and the adjoining Mesilla Valley 
and the proximity to Mexico. The infestation has continued. 
The Carlsbad infestation was found in 2 fields in 1920. Xo clean- 
up was undertaken, and the infestation reappeared in 1921. There 
was no recurrence, however, in 1922 or 1923. 
The Ennis, Tex., infestation, consisting of 5 fields, was found in 
1921. It originated with the shipment of 1-1 carloads of cottonseed 
from Xew Mexico before infestation had been found there. The in- 
fested area was cleaned up in 1921, 1922, and 1923, and intensive 
scouting has not disclosed any reinfestation. A noncotton zone was 
maintained during 1922, the clean-up work for that year being con- 
ducted in the fields immediately outside of the small zone necessary 
under State law. 
The Marilee infestation, consisting of two fields of the crop of 
1921, originated in the reshipment from Ennis to Marilee of some 
of the Xew Mexican cottonseed which caused the infestation at Ennis. 
The area was cleaned up in 1921 and a noncotton zone was maintained 
during the following year. The area was cleaned again in 1922 and 
1923. Xo reinfestation has occured. 
The detailed records of the amount of scouting performed in 
each of these districts are given in Table 2 and the locations of the 
several districts are shown in Figure 11. 
SCOUTING OUTSIDE OF KNOWN INFESTED DISTRICTS 
The most important consideration connected with the attempt 
to control the pink bollworm in the United States has been whether 
all infestations have been discovered. A very large amount of 
scouting has been done in regions outside of the various areas in 
which the insect has been found, including numerous points to which 
possibly infested material has been shipped. Whenever an infesta- 
tion has been found the shipments for the three preceding years 
which could possibly have introduced the insect have been traced 
to their destinations and careful scouting conducted. Of course, 
much attention has been given to scouting immediately outside of the 
various noncotton zones and regulated zones. Attention has been 
given to numerous reports of the occurrence of the insect which have 
been due to misidentifications. The routes of traffic from the 
Mexican border and the entire Mexican frontier have been thor- 
oughly inspected. Table 3 shows the amount of this scouting in 
the various States where it has been done. 
