THE PINK BOLLWORM 23 
larvae as might be in the soil. Certainly the vast majority of the 
insects in the field in the fall and winter are in the bolls on the 
plants and in the bolls and trash on the ground, and these are 
effectively disposed of. The remaining insects are in a very unfav- 
orable situation on account of the normally heavy winter rains, as 
experiments performed in Mexico show clearly that in moist soil the 
insect rarely if ever passes the winter alive. 
The following is a general outline of the lines of preventive work 
begun in 1917 and continued up to the present time : 
The exclusion from the United States of cottonseed from all foreign coun- 
tries except the Imperial Valley of Lower California, Mexico. Cottonseed from 
Hawaii and Porto Rico has also been excluded. 
The regulation and safeguarding of the entry of cottonseed products from 
all foreign countries and from Hawaii and Porto Rico. 
Regulation of entry and disinfection of all imported cotton and cotton 
waste, and of burlaps which have been used as wrappings of foreign cotton, 
including such material from Hawaii and Porto Rico. 
Survey, eradication, and control work in Texas and elsewhere, in cooperation 
with State authorities. 
Regulation of rail and other traffic with Mexico. 
Determination of distribution in Mexico and cooperation in control measures 
with the Mexican Government or local Mexican authorities. 
Investigation in Mexico of the life history and habits of the pink bollworm, 
as a basis for control measures. 
The work at the Texas border ports consists in the regulation of 
traffic from Mexico to prevent the importation, through accident or 
otherwise, of any Mexican cottonseed. It includes the inspection 
and disinfection of baggage, the cleaning or disinfection of all 
freight, express, and other shipments, except those which could not 
possibly carry infestation, restriction on the entry of railway cars 
from Mexico, regulation of the transfer of freight, express, and other 
shipments, certification of all cars or other carriers of merchandise 
as a condition of entry into the United States (excepting merchan- 
dise or other materials of strictly local origin), and the cleaning of 
domestic cars as a condition of receiving freight originating in 
Mexico for movement into the interior of the United States. 
The work in Mexico consists in research and in cooperation with 
the Mexican Government and planters for eradicating the pink boll- 
worm from that country. The loss which the pink bollworm has 
already shown itself capable of causing, and the fact that the cotton 
lands are owned by comparatively few persons, are grounds for 
hope that the main infestation in the Laguna district may be de- 
stroyed. Various conditions, however, have prevented any very de- 
finite progress along this line. 
CHRONOLOGICAL SUMMARY OF INFESTATIONS 
The origin of the Hearne infestation of 1917 has already been 
narrated, The area cleaned up comprised 1,62-1 acres, A noncotton 
zone was maintained for three years. No reinfestation has been 
found up to the present time. 
The Trinity Bay infestation comprised 156 fields of the crop of 
1917. A noncotton zone was provided in 1918, but, on account of a 
defective State law, it was discontinued during 1919. In the latter 
year 51 infested fields were found. In 1920, 1921, and 1922, noncot- 
