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BULLETIN 1397, 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, 1 in 1921, and none in 1922 or 1923. 

 The clean-up operations were conducted in each of the years except 

 1918, at a total cost of $219,266.68. 



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 Big 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 numier of infested fields in each 

 infested district for each crop to June 30, 1925 



District 



Texas: 



Hearne 



Trinity Bay-_. 



Big Bend 



Pecos Valley.-. 

 El Paso Valley. 



Ennis 



Marilee 



Louisiana: 



Cameron 



Shreveport 



New Mexico: 

 Mesilla Valley. 

 Carlsbad 



Totals: 



Texas 



Louisiana 



New Mexico. - 



Total 



1917 



1918 



471 



829 



4 



555 



103 











5 

 





 111 



1,962 



5 



111 



2,078 



1919 



650 

 1,796 



0) 



1,123 



158 











104 



46 







57 



3,727 

 150 

 57 



1920 



505 



2,006 







850 



339 











213 



486 



240 

 310 



3,729 

 699 

 521 



1,949 



1921 



369 



1,518 



22 



299 



78 



798 



340 



319 

 320 



27 

 63 



3,430 

 639 



4,153 



1922 



172 

 891 

 27 

 386 

 261 

 671 

 461 



632 

 332 



77 

 282 



2,881 

 964 

 347 



4,192 



1923 



255 

 1,225 

 66 

 421 

 406 

 740 

 611 



718 



231 

 1,212 



3,724 

 1,366 

 1,443 



6,533 





 1,030 

 167 

 631 

 397 

 835 

 612 



655 

 744 



3,672 



1,399 



955 



6,026 



1 In 1918, 1921, and 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. Twentj^-two fields were found infested. A non- 

 cotton zone was maintained effectively during the two following 

 years and there has been no recurrence of the infestation. The area 

 was cleaned up in 1919. 



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