42 



bulleti:j7 1103, u. s. depaetmext of agriculture. 



Table 10. — Monthly departures from normal temperature and rainfall in the 

 region infested hy the seed-corn maggot, January to June, inclusire, 1921 — 

 Continued. 



DEPARTURES (IN INCHES) FROM NORMAL RAINFALL IN 1921. 



New England 



New York 



Pennsylvania 



New Jersey 



West Virginia 



Maryland and Delaware 



Virginia 



North Carolina 



Regional mean 



-1.48 



-1.29 



-.66 



-1.03 



-.99 



-1.02 



-.12 



+.45 



-.76 



-0.55 

 -.26 

 -.26 

 + .25 

 -.45 

 -.35 

 -.20 

 +.22 



-.20 



-0.64 



+0. 77 i 



+.30 



+.45 



-.19 



-.23 



-.86 



-.11 1 



-.87 



-1.00 ; 



-1.25 



-.18 



-1.71 



-.44 



-1.50 



+ .51 1 



-.84 



-.02 1 



1 



-0.76 

 -1.41 

 + .26 

 +.21 

 + .45 

 + 1.73 

 +.76 

 +.41 



+.20 



-0.53 

 -.83 

 -1.18 

 -.30 

 -.44 

 -1.54 

 -2.03 

 -2.08 



-1.11 



COTTON BOLL WEEVIL. 



(Anthononiiis grandis Boh.)^ 



The. mild winter of 1920-21 and the wet summer of 1921 favored 

 an abnormal multiplication of the boll weevil throughout the terri- 



FiG. 23. — Increase in area infested by the cotton boll weevil in the United States from 

 1892 to 1921 in 10-year periods. 



torj'' infested by this insect. The weevil has now reached the limit 

 of cotton cultivation, except in western Texas, southwestern Okla- 

 homa, northeastern North Carolina, and Virginia. 



For the first time Missouri and Kentucky were invaded by the 

 weevil, and all fields in these States were found to be infested. 



The gain west of the Mississippi River is very nearly equal to that 

 east of the Mississippi River. The greatest gain in a single State, 



* Extracted from Department Circular 210, by B. 

 Williams, F. F. Bondy, and R. C. Gaines. 



R. Goad, E. S. Tucker, W .B. 



