4 BULLETIN 1103, U. S. DEPARTMENT OF AGRICULTURE. 



but the drought continued throughout the summer in the Middle 

 Atlantic States. 



The conditions throughout the Central and Mississippi Valley 

 States were somewhat similar to those along the Atlantic coast. 

 Here September, 1920, was a little above normal, excess temperatures 

 increasing in October and the moisture falling below normal in the 

 North-Central and East-Central States. November's temperature 

 was slightly beloAv normal throughout the entire region, with the 

 moisture decidedly below normal in the East-Central States. Decem- 

 ber, 1920, and January and February, 1921, were characterized by 

 increasing excess departures in temperature, running well over 5*^ 

 and reaching 10° in February in the North- Central and in March in 

 the East-Central States. The rainfall in December, January, and 

 February was generally about normal, with the exception of excessive 

 rainfall in December in the lower Mississippi Valley. March was 

 characteristically a wet month throughout the entire region. April 

 was generally warm, except in the Gulf States, as was also May. 

 Serious frosts occurred over the East-Central and West-Central 

 States in the latter part of March and first part of April, however, 

 destroying much of the fruit. The rainfall was above normal in the 

 North-Central States in April, while in the East-Central, West-Cen- 

 tral, and lower Mississippi Valley May was very dry. June, July, 

 and August were above normal in temperature throughout the entire 

 Central and Mississippi Valley regions, the moisture being below 

 normal in June in the North-Central and East-Central States, about 

 normal in the West-Central States, and above normal in the lower 

 Mississippi Valley. In July the rainfall was below and in August 

 above normal in the North-Central and East-Central States, while 

 the lower Mississippi Valley was experiencing a drought. Septem- 

 iDer, 1921, throughout this entire territory was above normal in both 

 temperature and rainfall, with the exception of a deficiency of rain- 

 fall in the lower Mississippi Valley. 



The regions in and west of the Rocky Mountains also had gener- 

 ally mild winter, with but few marked departures from the normal. 



The Pacific coast had excessive precipitation in December, 1920, 

 while the Southwest had a similar excess in June, July, and August 

 following a dry winter and spring. September, 1921, was dry 

 throughout this entire territory with the exception of the Pacific 

 Coast States and the temperature was normal or slightly below. 



The generally mild winter of 1920 and comparatively warm spring 

 of 1921 seemed to have been particularly favorable for the develop- 

 ment of lepidopterous insects. The corn earworm, European corn 

 borer, cankerworms, webworms, cutworms, alfalfa caterpillars, and 

 many other species were abnormally abundant in various parts of 

 the country. The cotton worm made one of its periodic northern 



